i wana ask that
> i have ram KVR1333D3N9/2G-SP (smaller in size than others), is there any difference in simple KVR1333D3N9/2G and KVR1333D3N9/2G-SP?
> secondly i wana purchase ASUS P7P55D mobo. and intell core i3 540.
Yes. It will work, but you'll need a separate video card for any p55 chipset board. If you want to use the onboard graphics with the 540, then get an h55 chipset board. I've used msi and biostar h55 boards, and they both work well with the onboard graphics.