Hi all, I need some feedback / help on undervolting my Phenom II 955.
I will describe the methodology that I am following below, please let me know if I am on the right path / what I can expect / what I can do better.
1. System configuration is in my signature
2. Disabled Cool and Quiet in the BIOS
3. Downloaded HWMonitor 1.15, IntelTestBurn V2.3 and K10Stat 0.91 and opened all of them
4. Set the processor to P0 state (3200 MHz, 1.35V default)
- Using K10Stat, reduced the CPU voltage by one step (12.5 mV, I think)
- ran IntelTestBurn on Standard settings for 5 iterations (this is the default). Just for the P0, I also ran High for 10 iterations.
- max CPU temperature was 52 C, idle is 32-35C, ambient is around 20 C
- repeat
I could get it down to 1.2125V. At 1.2V, programs started to crash, and I saw display corruption. Interestingly, this screwed up something, and from the next boot, the CPU temperature was showing as 0 C! I had to reflash the BIOS to get back proper CPU temperature.
So now I think that 1.225 V (one step more) is the lowest I can go.
5. Set the processor to P3 state (800 MHz, 0.975V default)
- Using K10stat, force the CPU to 800 MHz, now reduce the voltage by one step
- I am currently running this (0.875V was stable, now testing 0.86V)
My questions are:
1. Is this a good / optimal methodology?
2. I assume I have to repeat this for the other two p-states as well (I think I will set the frequencies to 1600 MHz and 2400 MHz)
3. How do I permanently set these up, once I have the final settings?
Thanks for your inputs.
I will describe the methodology that I am following below, please let me know if I am on the right path / what I can expect / what I can do better.
1. System configuration is in my signature
2. Disabled Cool and Quiet in the BIOS
3. Downloaded HWMonitor 1.15, IntelTestBurn V2.3 and K10Stat 0.91 and opened all of them
4. Set the processor to P0 state (3200 MHz, 1.35V default)
- Using K10Stat, reduced the CPU voltage by one step (12.5 mV, I think)
- ran IntelTestBurn on Standard settings for 5 iterations (this is the default). Just for the P0, I also ran High for 10 iterations.
- max CPU temperature was 52 C, idle is 32-35C, ambient is around 20 C
- repeat
I could get it down to 1.2125V. At 1.2V, programs started to crash, and I saw display corruption. Interestingly, this screwed up something, and from the next boot, the CPU temperature was showing as 0 C! I had to reflash the BIOS to get back proper CPU temperature.
So now I think that 1.225 V (one step more) is the lowest I can go.
5. Set the processor to P3 state (800 MHz, 0.975V default)
- Using K10stat, force the CPU to 800 MHz, now reduce the voltage by one step
- I am currently running this (0.875V was stable, now testing 0.86V)
My questions are:
1. Is this a good / optimal methodology?
2. I assume I have to repeat this for the other two p-states as well (I think I will set the frequencies to 1600 MHz and 2400 MHz)
3. How do I permanently set these up, once I have the final settings?
Thanks for your inputs.