What Is SO-DIMM?

SO-DIMM (Small Outline Dual In-line Memory Module)  is a modified DIMM module, smaller than a common DIMM module, suitable for mini pc, notebook computers, fax machines and various terminals.

Compared to a DIMM, so-DIMM has a smaller external size (about half the size of a normal DIMM). Therefore, SO-DIMM is mainly used for applications with high requirements on size, such as notebook computers. So-dimm has 72 pins (supporting 32-bit data transfer) or 144 pins or 200 pins (supporting 64-bit data transfer).

What type of computer is likely to use SO-DIMMs

SO-DIMM is commonly used for space-constrained systems such as laptops, small PCS based on small ITX motherboards, high-end office printers that can be upgraded, and networking hardware such as routers and NAS devices

How many pins does a DDR2 SO-DIMM module have?

The conductive contact on the connecting finger is also conventionally called the Pin number. DDR and DDR2 are both 200 pins. Because different memory uses different interface types, and each interface type uses different number of pins. Notebook memory generally uses 144Pin, 200Pin interface; Desktop memory uses 168Pin and 184Pin interfaces. The type of memory slot varies according to the number of pins used for the memory. Currently, the desktop system provides three types of MEMORY slots: SIMM, DIMM, and RIMM. The notebook memory slots are based on SIMM and DIMM slots, and the basic principle remains the same, with only a slight change in pin count.

Difference between DIMM and SO-DIMM

1. DIMM is a new type of memory module after the introduction of Pentium CPU. It provides 64-bit data channel. So-dimm is a computer memory with integrated circuits.

2. The goldfinger ends of the DIMM are not interchangeable, and the signals are transmitted independently, which can meet the transmission requirements of more data signals. So-dimm is more or less equivalent to dimming in terms of power and rated voltage. Although the memory module is small, the performance of the SO-DIM technique is no worse than that of large Dim.

3. DIMM provides 64-bit data channels, so it can be used singlehanded on a Pentium motherboard. It has 168 pins, so it is called 168 line memory. It is longer than the SIMM slot, and it also supports the new 168-line EDO-DRAM memory. The operating voltage of the DIMM chip is 3.3V.


Differences between U-DIMM、SO-DIMM、FB-DIMM and Reg-DIMM

U-DIMM is a common memory module that is not buffered and is targeted at the desktop market. 

Early SDR memory modules, of the Buffered type, are rare. The Buffered memory module is not the same thing as the Registered memory module mentioned later. Buffered memory modules pass addresses and control signals through buffers without any timing (buffer latency is present), whereas Registered memory modules store addresses and control signals and trigger output when the next clock arrives.

R-DIMM addresses and control signals are stored, clocks are PLL locked, and located in workstation and server markets. Registered memory modules have the advantage over Unbuffered memory modules in that they are easier to achieve higher capacity at both the module and motherboard levels and have increased stability. However, for a single read/write access, the clock cycle is delayed.

LRDIMM (Load - Reduced DIMM) uses a simple buffer instead of a complex register. Buffering reduces the power load on the lower motherboard, but has little impact on power and memory performance. Unlike RDIMMs and LRDIMMs, which allow server manufacturers to put more modules on each memory channel. As a result, LRDIMM designs can contain large volume system memory without incurring high latency costs.The LRDIMM uses a new technology and a lower operating voltage to reduce the load and power consumption of the server memory bus, and enables the server memory bus to work at a higher frequency and greatly increase the memory capacity.

1. RDIMM is relatively moderate in terms of price. A small-capacity UDIMM is relatively cheap, but a large-capacity UDIMM is even more expensive than a RDIMM due to its high manufacturing requirements. Lrdimms are more expensive than RDIMMs and UDIMMs.

2. In terms of memory capacity, only LRDIMMs support the maximum memory capacity. However, the memory capacity required by major applications can be achieved by deploying RDIMMs.

3. From the perspective of the main frequency, only RDIMMs support 1.6GHz, which provides greater bandwidth and hour delay.

4. In terms of latency, although uDIMMs at the same frequency have the lowest latency, RDIMMs support 1.6GHz, which reduces the latency.

5. In terms of power consumption, lRDIMMs are the highest, while RDIMMs and UDIMMs are lower.

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