Originally Posted by xeeki
Really? I didn't know that, could've been really frustrating if you bought 8 GB of 1066 MHz RAM, and it didn't work fully.
Originally Posted by BrightSide
Having 8GB of RAM wouldnt result in slower performance, but having 4 sticks instead of 2 would, if your using 1066 Mhz sticks at least. The CPU can only handle 1 stick of 1066 Mhz per channel, giving a maksimum of 2 sticks. If you add more than that, the memory will be slowed down to 800 Mhz to maintain stability.
BrightSide is right. I bought 2 different kits to test that out (all G.Skill), and here's what I found.
-- 8GB(4x2GB) of DDR2-1066
-- 8GB(4x2GB) of DDR2-800
With the 1066 RAM and 4GB in 1 channel, worked fine at 1066. With all 8GB in dual channel mode, like he said, it went down to 800MHz. Now, the interesting thing is that the Phenom chips have their own internal memory controller. I tried running the 8GB of the 1066 in single channel mode, and it ran fine for about 10 minutes at 1066MHz - before it BSOD'd on me, maybe a bad set of chips, I don't know - but something you might want to try.
With the 800 RAM, I was able to OC both 4GB in channel 1 and all 8GB in single and dual channel modes up to 1066 without any hassles. It's still running stable as can be.
Kind of interesting. I ended up returning the 1066 kit, esp since I wasn't gonna use it anymore anyway.