SO DIMM is an abbreviation for Small Outline Dual In-line Memory Module, and is a smaller form of DIMM used most often in notebook/portable computers, small form-factor computers (Such as those with a Mini ITX motherboard) and high-end upgradable office printers.
Second, the SDRAM chip is divided into two cell blocks, and data is interleaved between the two so that while a bit in one block is being accessed, the bit in the other is being prepared for access.
So system designs that are performance driven may want to start looking at this technology.
Because of the heavy electrical load it may be difficult for the chipset to send out the Address and Command signals with enough strength to directly drive all the DRAM chips on all the modules and meet the speed requirements.
SO-DIMMs are a smaller alternative to a DIMM, being roughly half the size of regular DIMMs.
This compares to regular DIMMs that have 168, 184, or 240 pins, all supporting 64-bit data transfer.
SO-DIMMs are more or less equal in power and voltage to DIMMs, and as memory technology moves forward, both SO-DIMMs and DIMMs are available in equal speed (PC3200, for example, and clock speeds such as 2.0, 2.5 and 3.0 CAS latency) and capacity (512MB, 1GB, etc.).
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