How many pins does a dimm have

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How many pins are on a sdram dimm on a dimm on a simm on a rimm? Can a pin dimm be replaced with a pin dimm? What type of computer uses the pin micro-dimm and pin so-dimm? What is dimm sockets? Where can one purchase a DIMM pin? Ddr2 sdram has a -pin dimm? Who has a pin DIMM?

How many notches would you expect to find on the connecting edge of a pin DIMM? What is ddr3 dimm? How many pins does a ddr3 so dimm have? How many pins does a DIMM have? Has two notches on the module? How wide is the data path for a pin DIMM? 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. So-called double-sided modules that really have multiple banks of chips onboard might be restricted on some systems in certain combinations.

Systems designed to accept extremely large amounts of RAM such as servers often require registered modules. 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. The registers temporarily hold data passing to and from the memory chips and enable many more RAM chips to be driven or otherwise placed on the module than the chipset could normally support.

This allows for motherboard designs that can support many modules and enables each module to have a larger number of chips. In general, registered modules are required by server or workstation motherboards designed to support more than four sockets.

Some vendors sell only this type of DIMM for particular systems. The important thing to note is that you can use only the type of module your motherboard or chipset is designed to support. For most, that is standard unbuffered modules or, in some cases, registered modules. These presence detect pins are either grounded or not connected to indicate the type of SIMM to the motherboard. 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.

This produces signals the memory interface logic can decode. If the motherboard uses presence detect signals, a power-on self test POST procedure can determine the size and speed of the installed SIMMs and adjust control and addressing signals automatically.

This enables autodetection of the memory size and speed. 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. When you drop the film into the camera, electrical contacts can read the film's speed rating via an industry-standard configuration.

Unfortunately, unlike the film industry, not everybody in the computer industry follows established standards. As such, presence detect signaling is not a standard throughout the PC industry. Different system manufacturers sometimes use different configurations for what is expected on these four pins.

Many of the systems from these vendors require special SIMMs that are basically the same as standard pin SIMMs, except for special presence detect requirements. Although very few if any of these systems are still in service, keep this information in mind if you are moving pin modules from one system to another or are installing salvaged memory into a system. Also, be sure you match the metal used on the module connectors and 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.

To have the most reliable system when using SIMM modules, you must install modules with gold-plated contacts into gold-plated sockets and modules with tin-plated contacts into tin-plated sockets only. 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. This has been a major problem with pin SIMM-based systems because some memory and motherboard vendors opted for tin sockets and connectors while others opted for gold.

After cleaning, to improve electrical contacts and help prevent corrosion, you should use a liquid contact enhancer and lubricant called Stabilant 22 from D. The company's website www. 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.

DIMMs can come in several varieties, including unbuffered and buffered as well as 3. Buffered DIMMs have additional buffer chips on them to interface to the motherboard. Unfortunately, these buffer chips slow down the DIMM and are not effective at higher speeds. Modern PC systems use only unbuffered 3. Apple and other non-PC systems can use the buffered 5V versions. This prevents inserting a DIMM of the wrong type into a given socket. Note that the key position is offset with respect to the center of the DIMM to prevent inserting it backward in the socket.

The key notch is positioned to the left, centered, or to the right of the area between pins 52 and The connector key is offset with respect to the center of the DIMM to prevent inserting it backward in the socket.

This prevents a backward insertion and prevents the wrong type voltage RIMM from being used in a system. Currently, all RIMMs run on 2. The current default is option A, as shown in Figure 6. As you can see, the Rambus memory channel flows from the memory controller through each of up to three RIMM modules in series. 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.

Note how the bus loops from one module to another. For timing purposes, the first RIMM socket must be 6" or less from the memory controller, and the entire length of the bus must not be more than it would take for a signal to go from one end to another in four data clocks, or about 5ns.

Rambus is merely a design company, and it has no chip fabs or manufacturing facilities of its own.