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Overclocking PhII x4 850

post #1 of 2
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I just built a new rig with a Phenom II x4 850 and a M4A78LT-M LX mobo. I am trying to overclock it lightly and undervolt it. So far, using AMD Overdrive (will write values to BIOS once i deem it stable) i've gotten 3520 MHz (220x16) @ 1.300v on the grinder, so far it is stable. I do not aim to get 4 GHz since the mobo is not meant for such power loads (i'm happy with getting 3.5 GHz and undervolting) and i'm using the stock HSF, but as i've never OC'd a non-Black edition CPU before, and i've OC'd just one other AMD CPU before (a x2 555 which i got to 3.5 GHz and undervolted, but i OC'd with the multi), hence i'm a little lacking in knowledge, and i got some questions:

- I'm trying to get overall best performance without raising any voltages, and i've decided with OCing the reference clock (Intel thinking much?). Is it a good idea to lower multi and aim for the highest reference clock i can get? Or should i stick with the maximum multi to OC?
- What should be my max temperature? So far i'm hitting 55c after 40 mins of Prime.
- NB speed is at 2200 MHz, but i've read it can give a lot of problems when raised over the base 2000 MHz. Is it true? Should i lower the multi to 9x to meet 1980 MHz?
- I'm testing with P95 Small FFT. Should i try other methods as well or just go Blend?
- Should i enable LLC? I see the Vcore on CPU-Z to go as low as 1.260v (quite a huge vdroop, even for software)
- Is there any other voltage i can safely lower? I do not dare mess with the NB VID just yet, mainly because i do not know what does it control exactly.
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post #2 of 2
Quote:
Originally Posted by Starbomba View Post

I just built a new rig with a Phenom II x4 850 and a M4A78LT-M LX mobo. I am trying to overclock it lightly and undervolt it. So far, using AMD Overdrive (will write values to BIOS once i deem it stable) i've gotten 3520 MHz (220x16) @ 1.300v on the grinder, so far it is stable. I do not aim to get 4 GHz since the mobo is not meant for such power loads (i'm happy with getting 3.5 GHz and undervolting) and i'm using the stock HSF, but as i've never OC'd a non-Black edition CPU before, and i've OC'd just one other AMD CPU before (a x2 555 which i got to 3.5 GHz and undervolted, but i OC'd with the multi), hence i'm a little lacking in knowledge, and i got some questions:
- I'm trying to get overall best performance without raising any voltages, and i've decided with OCing the reference clock (Intel thinking much?). Is it a good idea to lower multi and aim for the highest reference clock i can get? Or should i stick with the maximum multi to OC?
- What should be my max temperature? So far i'm hitting 55c after 40 mins of Prime.
- NB speed is at 2200 MHz, but i've read it can give a lot of problems when raised over the base 2000 MHz. Is it true? Should i lower the multi to 9x to meet 1980 MHz?
- I'm testing with P95 Small FFT. Should i try other methods as well or just go Blend?
- Should i enable LLC? I see the Vcore on CPU-Z to go as low as 1.260v (quite a huge vdroop, even for software)
- Is there any other voltage i can safely lower? I do not dare mess with the NB VID just yet, mainly because i do not know what does it control exactly.

- In my opinion, it doesn't really matter, but i read somewere that FSB OC-ing will boost the overall performance a lil bit
- max temp is 71'C (cores), keep it below 65'C, if possible
- NB OC (CPU/NB actually) will improve your system performance. This has to go as high as you can OC it. 2600 at least
- test with P95 blend
- If you enable LLC , your CPU voltage will go up under heavy loads --> higher clocks and temps
- NB VID is the voltage for CPU/NB. If you lower it, temps will go down a lil bit.

Since you are on stock cooler, keep CPU clock @ stock( lower the voltage as low as you can) and OC the CPU/NB.
If you hit, lets say 2600 for CPU/NB and the temps are OK, you can OC the CPU too
Edited by IOSEFINI - 11/19/11 at 6:18pm
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