Originally Posted by Samoflange
I still don't know how all of you get your NB to 2800mhz!!! and beyond. (So jealous).
Mine just wont be stable after 2600mhz. I've tried cranking voltage all the way up to 1.55v on CPU-NB and NB, it wont boot past 2725mhz no matter what! Always have to clear CMOS. I have a Phenom II 955 C2. Wondering if this is a CPU or MB issue? I can run my CPU 3.9ghz @ 54C, Prime95 7 hours 50 minutes stable.
Is it worth it trying to get my NB past 2600mhz? Will I see a similar performance jump?
Every little bit for me counts, especially when running GIMPS. The NB OC alone from stock to 2600mhz has saved me like a day in factoring. It seems to be the most noticeable compared to OCing my CPU or RAM.
I want to push it to the MAX! (stable though of course)
If you want to cold boot with your NB @ 2600-3000mhz, you'll need to increase your HTT/FSB clocks. You can leave your NB voltage at 1.25-1.35v and here are the NB clocks I acheived:
2600 (200x13) NB-CPU @ 1.15v
2750 (250x11) NB-CPU @ 1.372v
2800 (200x14) NB-CPU @ 1.45v
3000 (300x10) NB-CPU @ 1.48v
These values are with my RAM at 1333/1600 and CPU at 4-4.05ghz
I don't really understand why the 14x multiplier has a lot of trouble cold booting with lower voltages, but others in this thread have had the same problem and I suggest avoiding 14x if you can.