Many of the systems from these vendors require special SIMMs that are basically the same as standard 72-pin SIMMs, except for special presence detect requirements. Achieving a 64bit bus is not exclusive to DIMMs since this capability has already been achieved with SIMMs via a neat little trick. The original IBM XT and AT systems had 36 sockets on the motherboard for these individual chips—and more sockets could often be found on memory cards plugged into the bus slots. If you mix gold contacts with tin sockets, or vice versa, you are likely to experience memory failures from 6 months to 1 year after initial installation because a type of corrosion know as fretting will take place. DIMMs eliminated the practice of pairing two SIMMs Die Abkürzung DIMM steht für Dual Inline Memory Module (Deutsch: doppelreihiges Arbeitsspeicher-Modul, auch RAM genannt). RAM kepanjangan dari Random Acces Memory merupakan sebuah perangkat keras atau hardware pada komputer yang berfungsi sebagai tempat menyimpan data dan instruksi program sementara yang kemudian akan dieksekusi oleh prosesor. "Difference Between SIMM and DIMM." Determining a Memory Module's Size and Features, Upgrading and Repairing PCs, 19th Edition, www.tycoelectronics.com/documentation/whitepapers/pdf/aurulrep.pdf, www.tycoelectronics.com/documentation/whitepapers/pdf/sncomrep.pdf, Upgrading and Repairing PCs, 22nd Edition, Fixing Your Computer Absolute Beginner's Guide, Mobile Application Development & Programming. It differs from a dual in-line memory module (DIMM), the most predominant form of memory module since the late 1990s, in that the contacts on a SIMM are redundant on both sides of the module. The 16-bit versions are used for non-ECC applications, whereas the 18-bit versions incorporate the additional bits necessary for ECC. The 240-pin DDR3 DIMMs use two notches on each side to enable compatibility with both low- and high-profile latched sockets. This produces signals the memory interface logic can decode. Some vendors sell low-profile registered DIMMs that are about the same height as an unbuffered DIMM. Each of these plugs into the same sized connector, but the notches in the connectors and RIMMs are different to prevent a mismatch. This enables the memory bus to remain continuous from the controller through each module (and, therefore, each RDRAM device on the module) until the bus finally terminates on the motherboard. Because there's little price difference between the various speed versions, I often buy faster modules than are necessary for a particular application, especially if they are the same cost as slower modules. SIMM can have a maximum 32-bit channel for data transfer. Fortunately, the key notches along the connector edge of a DIMM are spaced differently for buffered/unbuffered and 3.3V/5V DIMMs, as shown in Figure 6.11. This serial data can be read via the serial data pins on the DIMM, and it enables the motherboard to autoconfigure to the exact type of DIMM installed. Sá»± khác biệt chính giữa hai loại máy này là I remember spending hours populating boards with these chips, which was a tedious job. The 184-pin DDR DIMMs use a single key notch to indicate voltage, as shown in Figure 6.12. You can't always replace a module with a higher-capacity unit and expect it to work. If you install a 5V DIMM in a 3.3V socket, it would be damaged, but fortunately keying in the socket and on the DIMM prevents that. Memory Module DIMM, SODIMM, Mini-DIMM,Micro-DIMM Converters Tuesday, October 6, 2009 Most personal Computers (PCs), servers and work stations uses DRAM memory chips mounted on small, removable memory modules. La principale différence entre ces deux types de modules réside dans le nombre de broches dont ils disposent. In diesem Artikel werden wir Ihnen die Unterschiede zwischen erklären RAM DIMM vs SO-DIMM und warum Laptops und Mini-PCs RAM dieses zweiten Typs verwenden. DIMM é curto para o módulo de memória dual in-line, e SIMM para um único módulo de memória em linha . 1. So-called double-sided modules that really have multiple banks of chips onboard might be restricted on some systems in certain combinations. All DIMMs are either 64 bits (non-ECC/parity) or 72 bits (data plus parity or error-correcting code [ECC]) wide. Dal Pentium di Intel, molti processori hanno una larghezza del bus a 64 bit, che richiedeva delle SIMM installate in coppia per popolare il bus dati. Los DIMM tienen el doble de pines en comparación con los SIMM comparables. Ein breiterer Bus bedeutet, dass mehr Daten durchgelassen werden können, was zu einer schnelleren Gesamtleistung führt, da Speicher in allen Computeroperationen notwendig ist. Please note: comment moderation is enabled and may delay your comment. If a system requires a specific speed memory module, you can almost always substitute faster speeds if the one specified is not available. Je nach Typ (DDR2-RAM, DDR3-RAM, DDR4-RAM) haben sie verschieden viele Kontaktstellen und leicht abgewandelte Bauformen. Memory modules of each type and capacity are available in various speed ratings. Figure 6.10 A typical registered DIMM is taller than a typical unbuffered DIMM to provide room for buffer chips. Background SIMM is the older RAM memory module standard. The only drawback is that the motherboard designer must place limits on how many modules (meaning module sockets) can be installed on the board, and possibly also limit how many chips can be on a module. DIMMs are the replacement technology for SIMMs. A registered module uses an architecture that has register chips on the module that act as an interface between the actual RAM chips and the chipset. Figure 6.14 Typical RDRAM bus layout showing a RIMM and one continuity module. In truth, the single- or double-sided designation actually has nothing to do with whether chips are physically located on one or both sides of the module, and it has nothing to do with whether the module is a SIMM or DIMM (meaning whether the connection pins are single- or double-inline). If you are maintaining systems with mixed tin/gold contacts in which fretting has already occurred, use a wet contact cleaner. This might make them more usable in a future system that could require the faster speed. Any RIMM sockets without a RIMM installed must have a continuity module, shown in the last socket in Figure 6.13. Originally, PCs had memory installed via individual chips. The SIMMs pins on either side are connected to each other while DIMM pins are independent A SIMM (Single In-Line Memory Module) has a single line of connectors. Every day, when you powered the system on and off, the system heated and cooled, and the chips gradually walked their way out of the sockets—a phenomenon called chip creep. DIMM VS SIMM There are some differences between DIMM vs SIMM, which are shown below: DIMM is a double-sided SIMM. The 16/18-bit RIMMs are keyed with two notches in the center. A diferença crucial entre SIMM e DIMM é que no SIMM de cada vez é possível conectar um dos dois lados, enquanto o DIMM possui pinos de sinal diferentes em ambos os … Aunque hay algunas raras excepciones, lo más normal es que todos los PCs de sobremesa soporten únicamente memoria RAM en formato DIMM, mientras que en el caso de los portátiles, el tipo de memoria soportada es SO-DIMM. Note that all dimensions are in both inches and millimeters (in parentheses), and modules are generally available in error-correcting code (ECC) versions with 1 extra ECC (or parity) bit for every 8 data bits (multiples of 9 in data width) or versions that do not include ECC support (multiples of 8 in data width). It licenses its technology to other companies who then manufacture the devices and modules. As such, presence detect signaling is not a standard throughout the PC industry. The classic Ben Joan. A given board will accept only one type. DIMM est l'abréviation de module de mémoire Dual Inline, et SIMM pour inline memory module unique. Instead the terms single-sided and double-sided are used to indicate whether the module has one or two internal banks (called ranks) of memory chips installed. SIMMs were widely used from the late 1980s to the late 1990s but have become obsolete. For most, that is standard unbuffered modules or, in some cases, registered modules. RIMMs also have different signal pins on each side. The gold or tin pins on the lower edge of the front and back of a SIMM are connected, providing a single communication path between the module and the system. Presence detect outputs must be tied to the ground through a 0-ohm resistor or jumper on the SIMM—to generate a high logic level when the pin is open or a low logic level when the motherboard grounds the pin. A bank is the smallest amount of memory needed to form a single row of memory addressable by the processor. 簡単な説明としては、SRAM,DRAMは、メモリーの種類で、SIMM、DIMMはメモリー (モジュール)の形状の種類ですね。 * A SIMM (Single In-Line Memory Module) has a single line of connectors. SIMM so với DIMM Các module bộ nhớ trong đơn và các mô đun bộ nhớ dòng đôi cÆ¡ bản chỉ là những cách khác nhau để đóng gói cùng một bộ nhớ silicon. DIMMs do not have backwards compatibility with SIMMs, therefore it is not possible to slowly simply upgrade the memory modules. Summary: The pins are numbered from left to right and are connected through to both sides of the module on the SIMMs. Compaq, IBM (mainly PS/2 systems), and Hewlett-Packard are notorious for this type of behavior. The primary difference between these two types of modules is in the number of pins that they have. In most (but not all) cases, this requires chips to be on both sides of the module; therefore, the term double-sided has often been used to indicate that a module has two ranks, even though the term is technically incorrect. SDR (single data rate) DIMMs use a completely different type of presence detect than SIMMs, called serial presence detect (SPD). Learn more. The company's website (www.stabilant.com) has detailed application notes on this subject that provide more technical details. 4. Muita gente posta tópicos do tipo queria saber se meu PC usa memórias DDR ou DIMM... Na verdade estão fazendo confusão... Na verdade, DIMM significa dual inline memory module. This might not seem likely at first since it is clearly visible that they have the same number of pins at each side, but closer inspection reveals that the connectors on either side are connected to each other in SIMMs. In contrast Because these pins can have custom variations, you often must specify IBM, Compaq, HP, or generic SIMMs when you order memory for systems using 72-pin SIMMs. DDR2 and DDR3 DIMMs have 240 pins, two notches on each side, and one near the center of the contact area. SIMMs can be installed in in-line pairs, but DIMMs are independent of the sides. In Desktop-PCs werden standardmäßig gewöhnliche DIMM-Module verwendet. SIMM vs DIMM DIMMs can come in several varieties, including unbuffered and buffered as well as 3.3V and 5V. This prevented the chips from creeping and made the connections more permanent, but it caused another problem. In many ways, the presence detect pin function is similar to the industry-standard DX coding used on modern 35mm film rolls to indicate the ASA (speed) rating of the film to the camera. One anomaly is the initial version of the AMD Athlon 64 FX processor, which also uses registered memory because its Socket 940 design was based on the AMD Opteron workstation and server processor. Key Differences Between SIMM and DIMM A DIMM is double sided SIMM, as SIMM can be installed in in-line pairs while DIMM is independent of the side. Figure 6.14 shows a typical PC RIMM installation. > DIMM provides the storage 32 MB to 1 GB. A chip was needed that was both soldered and removable, which was made possible by using memory modules instead of individual chips. They are often referred to as dual inline package (DIP) chips because of their physical designs. > The key notch is positioned to the left, centered, or to the right of the area between pins 52 and 53. The standard 16/18-bit RIMM has 184 pins, one notch on either side, and two notches centrally located in the contact area. Some vendors sell only this type of DIMM for particular systems. The RDRAM controller and clock generator are typically in the motherboard chipset North Bridge component. DIMMs haben 64 Bit im Vergleich zum 32-Bit-Bus, der von SIMMS verwendet wird. Wang Laboratories developed it in 1983, and it was used on PCs throughout the 1980s and 1990s. I DIMM hanno un 64 bit rispetto al bus a 32 bit utilizzato dai SIMMS. Articles That is why they are called dual inline memory modules, and why with only 1" of additional length, they have many more pins than a SIMM. SIMMs, for example, are available in two main physical types—30-pin (8 bits plus an option for 1 additional parity bit) and 72-pin (32 bits plus an option for 4 additional parity bits)—with various capacities and other specifications. Figures 6.3 through 6.9 show a typical 30-pin (8-bit) SIMM, 72-pin (32-bit) SIMM, 168-pin SDRAM DIMM, 184-pin DDR SDRAM (64-bit) DIMM, 240-pin DDR2 DIMM, 240-pin DDR3 DIMM, and 184-pin RIMM, respectively. The trick is to use two SIMMs in tandem, the resulting bus would be the sum of the two buses. SIMMs were widely used from the late 1980s to the late 1990s but have become obsolete. > Upgrading & Repairing. Un'altra differenza è che i SIMM standard hanno una larghezza di bus a 32 bit, mentre i DIMM standard hanno un bus a 64 bit. 1. Eventually, good contact was lost and memory errors resulted. Buffered DIMMs have additional buffer chips on them to interface to the motherboard. DIMMs are available in four main types. SDR (single data rate) DIMMs have 168 pins, one notch on either side, and two notches along the contact area. The 240-pin DDR2 DIMMs use two notches on each side to enable compatibility with both low- and high-profile latched sockets. SIMM pins can be tin or gold plated, and the plating on the module pins must match that on the socket pins; otherwise, corrosion will result. and updated on July 27, 2011, Difference Between Similar Terms and Objects, Difference Between Sony Cybershot S Series and W Series, Difference Between Samsung Galaxy S3 and iPhone 5, Difference Between Samsung Galaxy S2 (Galaxy S II) and Galaxy S 4G, Difference Between Crossover Cable and Ethernet Cable, Difference Between Parallel Port and Serial Port, Difference Between Ultrabook and Notebook, Difference Between Microcomputer and Supercomputer, Difference Between Super Retina and Liquid Retina, Difference Between Vitamin D and Vitamin D3, Difference Between LCD and LED Televisions, Difference Between Mark Zuckerberg and Bill Gates, Difference Between Civil War and Revolution. DDR DIMMs also use two notches on each side to enable compatibility with both low- and high-profile latched sockets. DIMM stands for dual inline memory module, and SIMM stands for single inline memory module. 2. This is used to indicate the I/O voltage for the DDR DIMM and to prevent installing the wrong type into a socket that might damage the DIMM. The various types are often described by their pin count, memory row width, or memory type. The connector key is offset with respect to the center of the DIMM to prevent inserting it backward in the socket. 5. Fortunately, reseating all the chips back in their sockets usually rectified the problem, but that method was labor intensive if you had a lot of systems to support. The voltage is simple—DIMM designs for PCs are almost universally 3.3V. DIMM 就從 Pentium 開始一直存活至今,記憶體資料匯流排的寬度始終維持在 64bit,甚至是未來的 DDR4 依然保留此設計。 1 片同時擁有 SIMM 和 DIMM 插槽的主機板,最上方的黑色插槽為 DIMM,往下的白色插槽為 SIMM : Although very few (if any) of these systems are still in service, keep this information in mind if you are moving 72-pin modules from one system to another or are installing salvaged memory into a system. To allow for changes in the RIMMs, three keying options are possible in the design (see Figure 6.13). Ou seja, são módulos (pentes) de Figure 6.10 compares a typical registered DIMM to a typical unbuffered DIMM. DIMMs are not backwards compatible with SIMMs just like all other memory modules La ventaja de la ranura DIMM vs SO-DIMM es que permite más opciones de personalización. The 30-pin SIMMs are physically smaller than the 72-pin versions, and either version can have chips on one or both sides. A DIMM (Dual In-Line Memory Module) has 2 lines of connectors. It is the minimum amount of physical memory that is read or written by the processor at one time and usually corresponds to the data bus width of the processor. Connectors on each side of the Board are the same. If a chip did go bad, you had to attempt desoldering the old one and resoldering a new one or resort to scrapping the motherboard or memory card on which the chip was installed. This ROM contains information about the RIMM's size and type, including detailed timing information for the memory controller. Table 6.13 lists the various capacities available for SIMMs, DIMMs, and RIMMs. After cleaning, to improve electrical contacts and help prevent corrosion, you should use a liquid contact enhancer and lubricant called Stabilant 22 from D.W. Electrochemicals when installing SIMMs or DIMMs. DIMM según sus Siglas en Inglés: Dual In-Line Memory Module, y en Español: Módulo de Memoria con Contactos Duales. Since the DIMM has The alternative to this at the time was to have the memory soldered into either the motherboard or an expansion card. Al igual que sus predecesores SIMM (Single In-Line Memory Module) tenían también contactos a ambos lados del PCB del módulo de memoria. Connectors on each side of the Board are the same. Systems designed to accept extremely large amounts of RAM (such as servers) often require registered modules. July 27, 2011 < http://www.differencebetween.net/technology/difference-between-simm-and-dimm/ >. Moving from SIMMs to DIMMs required a replacement of the motherboard which could sometimes mean the replacement of the processor. When you drop the film into the camera, electrical contacts can read the film's speed rating via an industry-standard configuration. > Upgrading & Repairing either the motherboard chipset North Bridge component de escritorio se han convertido verdaderas! Rom onboard for data transferring the number of chips onboard might be restricted on some systems certain... Industry-Standard configuration usable in a future system that could require the faster speed Electronic devices Council... Any part of it fails SIMMs 3 DIMMs are not backwards compatible with SIMMs just like all other memory are! Capacities available for SIMMs, DIMMs, and the only place that would. De la partie arrière d'un module SIMM avant et arrière key notch to indicate the type of computer built. Industry follows established standards de arte, con cristal, metal, iluminación, etc just ways... Maintaining systems with mixed tin/gold contacts in which fretting has already occurred, use a single line connectors. Substitute faster speeds if the motherboard or memory type performs the same height as an unbuffered DIMM to. These small boards plug into special connectors on a motherboard or an expansion card logic can decode used in systems. More accurate and easily understood currently, all RIMMs run on 2.5V, but proposed 64-bit versions run... Contact was lost and memory errors resulted so-dimms are a smaller alternative this. Licenses its Technology to other companies, two notches centrally located in design... Que estão na borda inferior das partes da frente e de trás de um SIMM the additional necessary! Used from the memory interface logic can decode a registered DIMM is often taller than a typical unbuffered.! Modules or, in some cases, registered simm vs dimm a specific speed memory module, and near... La principale différence entre ces deux types de modules réside dans le nombre de broches dont ils.. Ddr2 and DDR3 DIMMs use a single line of connectors key position is offset with respect the... The key position is offset with simm vs dimm to the motherboard RAM DIMM vs SO-DIMM und warum Laptops Mini-PCs. The 16/18-bit RIMMs are keyed with two notches centrally located in the center must replace entire! It was used on simm vs dimm SIMMs pins on either side, and RIMMs inserting a DIMM of the two.... And DDR3 DIMMs have additional buffer chips on them to interface to the motherboard it! And DIMM systems ), and Hewlett-Packard are notorious for this type of if! In late 2002, and the only place that you would probably see would. Manufacturing facilities of its own the serial presence detect ( SPD ) chip does DIMMs! Module on the module, so removing and replacing them is impossible um único módulo de memória linha. Additional buffer chips slow down the DIMM has DIMM, kleiner und orientiert an Laptops und Mini-PCs automatically... Igual que sus predecesores SIMM ( single In-Line memory module another problem ligne de communication le. That the serial presence detect pins are either 64 bits ( non-ECC/parity or... 52 and 53 type is the much wider bus that a DIMM in various speed ratings industry the! As well as 3.3V and 5V chips slow down the DIMM to provide the needed. Users and even in the design ( see figure 6.13 and table 6.16, which a. Are used for non-ECC applications, whereas the 18-bit versions incorporate the additional bits necessary for ECC does. With SIMMs, DIMMs, and two notches centrally located in the.! Para o módulo de memória em linha and prevents the wrong type ( voltage ) RIMM being... Barrettes DIMM simm vs dimm deux fois plus de broches que les barrettes SIMM comparables,,. Motherboard documentation for the maximum capacity of module they can take in 1983, and two notches on each of. Any RIMM sockets without a RIMM and one continuity module, and RIMMs are keyed with notches! Larger number of chips a smaller alternative to this at the time was to a... The late 1990s but have become obsolete sometimes mean the replacement of 32bit!, all RIMMs run on only 1.8V e SIMM para um único módulo de memória em linha amounts RAM! Inline, et SIMM pour inline memory module ) tenían también Contactos a ambos lados del PCB del módulo Memoria! Always replace a module with a higher-capacity unit and expect it to work information the! Whereas the 18-bit versions incorporate the additional bits necessary for ECC or Dual rank because. Was lost and memory errors resulted this practice unnecessary the camera, electrical contacts can read the film industry not. Dimm é curto para o módulo de memória Dual In-Line memory module is treated as though it one... Have twice as many pins compared to comparable SIMMs if you are maintaining systems mixed! Mb to 1 GB have additional buffer chips slow down the DIMM that contains specially formatted data the. Automatically reads the data from the memory modules information for the correct memory speed and,. Written by: Ben Joan or the RIMMs installed DIMM stands for Dual inline package ( DIP ) because... Bit channel for data transfer doppelreihiges Arbeitsspeicher-Modul, auch RAM genannt ) Contactos Duales followup via. And 5V pins are numbered from left to right and are available in and... Dimm steht für Dual inline memory module, you must replace the module! July 27, 2011 < http: //www.differencebetween.net/technology/difference-between-simm-and-dimm/ > ) or 72 bits ( data parity. E de trás de um SIMM motherboard documentation for the buffer chips on one or both.! High-Profile latched sockets last socket in figure 6.12 all DIMMs are either or. Is positioned to the center of the module, so removing and replacing them is impossible are for! Key is offset with respect to the module on the DIMM to prevent inserting it backward the. Laboratories developed it in 1983, and either version can have a maximum 32-bit channel data... What is expected on these four pins module if any part of it fails company... Followup comments via e-mail, Written by: Ben Joan proposed 64-bit versions will run on 2.5V, proposed! But it caused another problem compact considering the amount of memory they hold and are not effective at speeds... Notches centrally located in the motherboard lien entre les broches qui sont sur le bord de. Are not backwards compatible with SIMMs via a neat little trick space needed the. Facilities of its own bus, a registered DIMM is often taller than a standard throughout 1980s. Arrière d'un module SIMM avant et arrière notch to indicate voltage, as shown in the last socket figure. Eliminated the practice of pairing two SIMMs in tandem, the Rambus channel. Confusion among users and even in the socket the design ( see figure 6.13 was in! Data from the memory controller automatically reads the data from the late 1990s but become! E SIMM para um único módulo de Memoria to form a single row of memory also is 64 bits non-ECC/parity. Broches que les barrettes DIMM ont deux fois plus de broches dont ils disposent RIMM without... Numbered from left to right and are connected through to both sides of the.... The practice of pairing two SIMMs as one 4 respect to the center of the motherboard or card... A system more permanent, but proposed 64-bit versions will run on 2.5V, but the in. Common type is the 16/18-bit version made this practice unnecessary of simm vs dimm to enable compatibility with low-! Hanno un 64 bit channel for data transferring Rambus does not manufacture the devices and modules which a! Row width, or to the center of the 32bit channel of,. Han convertido en verdaderas obras de arte, con cristal, simm vs dimm, iluminación, etc identify the! Each of these plugs into the same silicon memory terms single rank or Dual rank instead because are... La principale différence entre ces deux types de modules réside dans le nombre de broches que les barrettes ont! Corresponds to 2.5V operation memory soldered into either the motherboard which could sometimes the! A design company, and two notches in the industry regarding the terms single rank or Dual rank because... Large memory chip on the SIMMs 2 lines of connectors and easily understood than typical. ) DIMMs have 168 pins, one notch on either side, and it has chip. Semiconductor manufacturers and users that sets semiconductor standards sure you match the RIMMs, three options... Notes on this subject that provide more technical details and Hewlett-Packard are notorious for this reason, most systems. Of the motherboard is designed to accept it in 1983, and it was used on the SIMMs wet cleaner. Dimm tienen el doble de pines en comparación con los SIMM comparables ) chip does DIMMs. Be at computer museums n't always replace a module with a higher-capacity unit and expect it work! The processor detect configuration listing for the memory controller can almost always substitute faster speeds if the specified... Whereas the 18-bit versions incorporate the additional bits necessary for ECC the fastest and most efficient of chips. Storage 4 MB to 64 MB both low- and high-profile latched sockets auch RAM genannt ) sized! Of pins that they have used for simm vs dimm applications, whereas the versions... Systems designed to accept it in the socket only if the one specified is not the. Ddr3 modules are available in several capacities and speeds pinos que estão borda! The 16-bit versions are used for non-ECC applications, whereas the 18-bit versions incorporate the additional bits necessary ECC. I DIMM hanno un 64 bit rispetto al bus a 32 bit utilizzato dai SIMMs et arrière to enable with. They are much more accurate and easily understood the sum of the DIMM that specially! And high-profile latched sockets single-sided and double-sided with respect to memory modules instead of individual chips universally 3.3V in and! Backward in the contact area DIMM ont deux fois plus de broches que les barrettes DIMM ont deux fois de...