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[sierra_bound]

Lucky you, too There ere not many X5650 around, and we should try to share experiences, specially on VVT/BCLK limitations.
Have you posted your OC setting/results somewhere i could take a look?

We must get a OC-able double socket MB, and first then the X5650 will show it's real muscles

My set-up is similar to yours. Same cooler (Noctua NF-D14), RAM is Corsair 7-8-7-20, slightly different board (Gigabyte GA-X58A-UD3R), and different PSU (SeaSonic 650W). The graphics card is something I've had for five years.

To be honest, I have not done a lot of tweaking. The CPU is running right now at 170 x 22 which is a lower overclock than what you have. RAM timings are all default. I assembled the entire system in about 15 minutes. I just wanted to get it crunching as soon as possible. VTT is at 1.32. I can't even remember what VCore is set at. I think it's below 1.27v but I would have to check.

I know that there are problems getting BCLK above 180 and that running VTT above 1.35 is very risky. I think after it's been crunching for another month, I may play around with the BIOS settings a little more.