Hi guys! I want to add additional memory to my 20-inch last generation iMac. But i'm not sure about buying the right type of that memory. So, are the SO-DIMM DDR2 PC2-6400 and SO-DIMM PC-6400 the same things, or not? Here is what it looks like in different prices: - DDRII \ SO-DIMM DDRII 2GB PC2-6400(800) Hynix - SO-DIMM DDRII 2048 Mb (pc-6400) 800MHz Hynix Thanks!