Hi Will Kingston Value Ram (part#KVR400AK2/1GR) work on the P4P800-E: 1GB Kit 400MHz DDR PC3200 DIMM 3-3-3 (Retail) Standard 64M X 64 Non-ECC 400MHz 184-pin Unbuffered DIMMSDRAM-DDR, 2.6V, CL3, Gold Link for the RAM: [URL]http://www.valueram.com/config/partsInfoTest2.asp?ktcpartno=KVR400AK2/1GR[/URL] I noticed this ram has different specs than there more pricey Kingston. Will there be a noticeable difference in speed?? Thanks, Martin