P8800 Best Undervolting Numbers (RMClock)

My P8800 reaches 97 Cels. when I run Orthos, and today I tried playing COD 4 Warfare, then it went to 99 Cels. degrees and my Z was blowing FIRE from the vent.

Now, I'm planning to use RMClock to undervolt my CPU, my system specs is in Signature, except that I Updated from Vista SP2 64 to Windows 7 Pro 64.

I know I'm Lazy to try the Awesome Undervolting guide here at NBR, but truly, want to avoid consuming much time with trials and errors, so :

I'm Looking for the BEST RMClock Settings (Volts), SAFE ONES, That I can put into RMClock and rest in peace afterwards.

I Know that Z is not a Gaming Machine, But when I got COD 4 I'm tempted to play it.

Finally, after receiving the Safe volts to use in RMClock, do You guys Use any App to make the same to the nVidia 9300M GS?

Please guys reply with a simple sentence if you don't have time to write much, plus since the P8800 is very common now, this will be helpful to other members, especially Vaio Z Owners.

Regards;

Will

 

It is impossible to tell the "best undervolting numbers" for any CPU, because each produced sample is different.

Two P8800 could have radically different undervolting capabilities - same goes as for overclocking.

The only way to figure out lowest stable voltages is to either manually test (voltage by voltage) - or to use some application that can automate that.

If you are too lazy to do it - you can download trial version of CPUgenie and let it's CPU voltage wizard test the voltages for you and find the lowest stable voltages.

 

The easiest way to do undervolt is with CPUgenie, which is a much much more updated program than RMClock.

You can download it here: http://www.clockmod.com/

It's not a free utility, BUT for the lazy way out, it has a function where it will tune the program to your specific CPU to best voltages. The program is more stable than RMClock, has better support, AND...the machine they tested their program on was a Sony Z, and they were able to lower their temps by 26 degrees!


I've undervolted my CPU, as well as applied IC Diamond 7 (diamond compound > pure silver grease > Crap Sony Heatpads), and the MAX temps on the CPU/GPU coming from my Z is 72 degrees at full load either playing COD4, MW2, or running Orthos. And this is gaming for ~2 hours, and both Coretemp and HWmonitor reported 72 was the highest it ever reached.

 

Still willing to be told from a P8800 user if he is using RMC, the reason is CPUGenie volt optimizations takes forever, and I even cannot leave my Z running overnight, when I do that, I wake up to find it BSOD, and only passed 35 volts tests out of 158 test, in real life, I must be infront of it all the time

 

Yeah, CPUgenie does all the tests unfortunately - but that is the only way to ensure that the lowest possible voltage is found and know how many tests would be there in advance.

I never do the automated tests (although I'm using CPUgenie) - but rather employ a simple "algorithm" by hand:

1. Start with the highest multiplier/frequency

2. I do "big" steps (e.g. ~0.5V) down until BSOD/reboot happens

3. When BSOD happens, I start increasing voltages by 0.125v until no errors happen

4. This lowest voltage for a frequency F - must be working for all frequencies below (at least this was the case with all CPUs I have seen) - so no need to test higher voltages for lower frequencies

Hmm, when I think of it - I'll propose this to the CPUgenie devs - I guess they can't do "big steps" as there would be too much BSODs, but going from the highest to the lowest frequency would really cut some unnecessary tests

However, in that case it would be impossible to tell how much time is left - as it is impossible to know how low can you go beforehand.

But for "hand optimization" it is a good way to do it - unfortunately it will not spare you from ocassional BSOD - so I strongly suggest to do this from a fresh Windows installation or with backed-up documents.

Just in case.

 

If used correctly, you can indeed get some pretty good results with RMClock.

I managed to lower my voltage (on a P9600) by 0.1 - 0.125 volt at every multiplier. My voltage for 10.0x multiplier is 0.9750 V, which somehow appears to be lower than the voltage for 9.0x given by clockmod.com. My max temperature in Orthos dropped from around 85 to around 63 degrees.

I second psyq321 that each processor is different. I've seen people with P9600 undervolting to lower values, and people that cannot undervolt as much.

There's a step by step tutorial on Tom's Hardware, guiding you to accurately undervolt your processor using RMClock.

Hope this helps.

 

I have a P9600, too. My original voltage for 10.0x multiplier is 1.0375V and the lowest voltage is 0.8750. So, I can only undervolt to 0.9500V, less than 0.1V, so the temperature drops only about 8-10°C, not very much