I purchased a PNY optima memory 256 mb pc2700 ram. I run a Intel Pentium 4 2.80 Ghz 2 cpu (each). My problem is that when my regular ram chip (512mb) runs perfectly and when i add my 256 mb ram chip in the computer will not say anything about new hardware. Plus on Dxdiag and System info it doesnt recognize the chip it only says 512....anyone know what the prob is? When i just run one ram at a time it will show but if i run both of them at the same time it will only show the 512.