When building a server on a Socket A motherboard, one may have the need for lots of RAM. The Nforce2 dual channel chipset is usually found on motherboards with three DIMM sockets allowing 3 gB. Since 512 mB modules are cheaper than 1024 mB modules, I found a mobo with four sockets, thinking I could use 4 X 512 mB to get 2 gB more cheaply than 2 X 512 + 1X 1024. However, there is a "Catch-22". While the first two modules of 512 mB may be either single or double sided, the last two must be single sided. Is there a site that classifies DIMMs by sided-ness? The DIMM manufacturers, chip makers and mobo makers do not seem to speak the same language when they describe organisation. From what I have found so far, the 512 mB single sided DIMMs are rare and expensive so the advantage of 4 sockets on Gigabyte's GA7N400L1 may be illusory.

I've found a lot of hard to find memory and good tech help at crucial.com
Don't know about your particular needs but they can probaly help.

Single sided memory is more common than double sided memory. If you see something like 64M X 64 bit for 512 megabytes memory module, it will mean its single sided. What 64M X 64 bits mean is it uses 64 megabyte memory chips and the each chip has 8 bit data bus. This comes to about 8 chips. About 8 chips can fit on one side. If you see something like 32M X 64 bits, it will be double sided memory that will have 16 chips total on the memory module. You can always call or e-mail the computer store for more information.

BTW, this thread should be in General.