I own an XFX 680i nforce motherboard. My Ram recently died and I wanted to replace it. I originally had two gig sticks of PC2-8500 1066 Mhz ram from corsair. It was part of the dominator series. I was shopping around and found some other ram from Team Group. It was called Xtreem Dark Series PC2 8500 DDR 1066 MHz. Now I wasn't sure of compatibility with my motherboard and SLI so I emailed them about it. They sent a response that said: “Xtreem Dark Series PC2 8500 DDR2 1066MHz CL 5” don’t support the SLI function But can use in “XFX NVIDIA nForce 680i SLI” mortherboard Does this mean I can use it or not? I currently have two cards in SLI. How important is SLI compatibility in memory? One more question, I noticed my motherboard's FSB is 1333, and my CPU is 1333, but couldn't find any DDR2 ram with 1333. Am I retarded?