[pscout]

You may or may not be able to reach your goal running at an 8 multi instead of the stock 9 since that would require a higher oc from your memory.

I expect your 667 memory should be able to get to 700+ stable which is fast enuf with a 9 multi running 1:1. Your mobo can only supply up to 2.1V to the memory.

What memory do you have ... brand/model timings?

Also, you should search/google oc'ing a p5b-d ... the basics are the same but the p5b has fewer settings you can adjust. A read of some of the better ones should help give you a reasonable understanding. P5b-d was one of the favoured 965 mobos for oc'ing so there are lots of threads around on the various fora. And there are a few guides which are easier to read than some of the long forum threads filled with chatter.

I have a p5b and p5b-d both with 6600's but i haven't oc'ed them in 6-8 months. They have been folding ever since built. My p5b has my worst E6600 on it - it is only running at 325x9 ... it will be my next rig to upgrade replacing the e6600 with a Q6600.
The p5b-d is my main rig for work and folds, and is conservatively running at 8x390 and it uses raid 5+0 on the ich8r.