not easy as cake. 8.5 x 400 would lock my system left and right even with 1.3375 cpu voltage set in the bios... Cpu-z reporting 1.29 v ish under load. I had upped the FSB overvoltage to +.2v didnt help much lasted a few hours before crash, I dont want to push it to +.3v and cause problems with the south bridge.
This is with the vdroop mod penciled. I even couldnt get 8x400 stable ironically it would lock even more. Either I got a bad chip or the board stinks. Tried just about everything. Cpu temps were around 65 while running prime 95 small fft.
In the end, i am running it stock. Oh well 🙂