Ok, most of my comp stuff just arrived today (still waiting on case & HD), and I was reading the mobo manual. It's the P4P800 SE from Asus, and I was reading the "Qualified Vendor List" table, which lists the DDR400 Modules that have been tested and qualified for the mobo and there were 3 model #s for Kingston. Well, I have x2 256 DIMMs (retail) from Kingston and the product model# is KVR400X64C3AK2/512, and this number isn't under the table. Does that mean that I can't use these Modules or that they just haven't been tested and qualified (yet)?