Just put together a new system with an ECS motherboard (P4M800PRO-M) and an Intel Pent 4 3.2 Ghs processor. I put in two Kingston DDR2 512MB RAM modules (PC2-4200 -- 533 MHz). Installed WIN XP (home). It boots up fine -- but runs very slow. I ran Belarc and it reports 256 as total physical installed memory -- but it does show 512 in both slots (DIMM0 & DIMM1). Kingston's website says RAM is appropriate for this motherboard. I originally had a WinFast 128MB video card installed -- but thought maybe that was eating the RAM so took it out and am just running off the internal VIA/S3G Pro IGP. Anyone have an idea of where my RAM has gone -- and how I can get it back?