Undervolting a 9950

Your processor has a nominal voltagerange of 1.05-1.30V as can be seen here:

http://products.amd.com/en-ca/DesktopCPUDetail.aspx?id=...

So you should be fine as long as you're in this range. I don't have any experience with your particular chip but undervolting does help save some power and in theory I guess it could also keep your temps lower.

If it were me I would drop it down incrementally. You should be safe jumping to 1.2V but from there I would lower incrementally to 1.05V just to ensure everything is stable. I personally wouldn't go lower than the minimum of 1.05V though. Good luck!

oops I just realized the stock speed is 2.6 Ghz, not 2.8, my bad lol

Shouldn't make much of a difference...it still has the same voltage range. Try it and see what you can do. It may be worth having a look through the following article:

http://www.tomshardware.com/reviews/undervolt-cpu-pheno...

I know it says Phenom II chips but the same general principles should still apply. Hope this helps!