I have an E6750 which I'm either gonna use in an X38 or P35 mobo, not sure yet which. The Proc runs at 1333mhz bus speed which I understand is 333mhz, quad-pumped. I will get a mobo that has a 1333mhz bus again which I understand to be a base clock speed of 333mhz, quad-pumped. My question is about the RAM bus speed relationship to the other two. I was planning on DDR2-800mhz which I understand is 400mhz dual-pumped? Now I see the base clock is higher for the RAM at 400mhz but if it cannot run at quad-pumped would I see better performance from DDR2 with a faster base clock? Or because it cant quad-pump 400mhz is plenty? Or am I just completely misunderstanding all of this? If anyone has any suggestions about the motherboard I would appreciate it. Thank you guys.