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[Help] Underclocking/undervolting Phn II x4 955 BE

post #1 of 14
Thread Starter 
Hi guys,

So recently i noticed that the temperatures have gone too high and i experienced a BSOD during gaming, which i believe it was dued to the high temperatures because after restart the mobo temperature was 45 celsius and the CPU was 42, which is uncomfortably high during idle

So i decided i'd give underclocking and undervolting a chance before i upgrade my cooling later this year.

My specs are in my signiture, i enetered the BIOS and i looked for the multiplier but i couldn't find it. I only found something called CPU/ NB ratio which was set to 200Mhz(i believe this was the bus frequency) but no sign of anything saying "Multiplier".

Please let me know what i should do and let me know if i also have to modify manually the voltages if i reduce the multiplier to 14 lfor example. I noticed many voltage settings were set to "Auto" so my presumption is that they will lower by themselves if i the multiplier is decreased, but i'm no expert so feel free to correct me.

To recap, i would firstly like to know how to underclock using the multiplier not the bus frequency, secondly if someone has intimate knowledge of my mobo maybe they could guide me through the undervolting process.

Thank you!
Edited by Pentdragon - 5/27/11 at 6:55am
post #2 of 14
CPU Ratio is the multiplier.
You should lower the CPU voltage
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by IOSEFINI;13654670 
CPU Ratio is the multiplier.
You should lower the CPU voltage


Are you sure? Cause i never heared of a multiplier with the value *200*....
post #4 of 14
Quote:
Originally Posted by Pentdragon;13654698 
Are you sure? Cause i never heared of a multiplier with the value *200*....

that may be your FSB.
Can you post a pic. with your BIOS? I just checked your mobo's manual, and the multi is called CPU Ratio. I have an ASUS mobo too, and my multi is called that way
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post #5 of 14
Have you tried reapplying thermal paste & reseating the fansync/cpu? There is no reason for you to be having temp problems with the stock AMD heatsync tbh, Im using it at the moment, and i've mine overclocked (in sig) and my max temps during load are ~40.
post #6 of 14
You will get more from undervolting then you will from underclocking it. I wouldn't recommend underclocking that chip any lower then stock. 3.2ghz is about as low as you want to go. You should be able to volt it down to like 1.15 or 1.2 at stock clocks.
Voltage is what lowers temps, not clock speed.
post #7 of 14
Thread Starter 
Quote:
Originally Posted by IOSEFINI;13654746 
that may be your FSB.
Can you post a pic. with your BIOS? I just checked your mobo's manual, and the multi is called CPU Ratio. I have an ASUS mobo too, and my multi is called that way

I can't take a picture i'm sorry but i just rentered the BIOS and i noted some of the things it says there:

CPU level UP (with the following options):
- AUTO
- Phenom 3.4G
-Phenom 3.6G
-Phenom 3.8G
_____________________________________________
CPU Overclocking (with the following options):
- AUTO
- Manual
- D.O.C.P.
- CPU LEVEL UP
- Overclock Profile

CPU ratio set to [AUTO], it doesn't allow me to change it even if i set the "CPU overclock" to Manual.
Under CPU ratio it says:
CPU/HT reference clock 200 Mhz (this can be changed).

@Asmodean
My temps are high cause i keep the CPU fan profile on "Silent", on standard and Turbo it is way too loud and creates lots of vibrations...

@thrasherht
Can you guide me through? What exact parameters should i change?Just VID from 1.38 V to 1.20 V? The rest i keep the same?
post #8 of 14
FYI, blow $15 on a Hyper 212+, my temps dropped 15-20C from stock HSF.
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post #9 of 14
I have an ASUS board with similar bios options and the same chip. If I remember rightly you need to select manual in the cpu overclock setting then the multiplier option should appear.

I agree though, underclocking and undervolting from the bios may cause a bit of instability.

I use a little program called PhenomMsrTweaker, you can easily adjust multi's an voltage. Its easy to use and you can have it behave differently for different windows powerplans.

The program is a must for Phenom owners I think. You can adjust the CnQ steps for the Multis it uses and the voltages. Mine Idles at 800Mhz and 0.8volt

The program relies on the fact that cool n quiet is turned on in the bios, and now i think of it, it doesn't sound like you have it on. My 955 Idles at 32, 42 sounds high for having cool n quiet on.
Edited by ManOnFire - 5/27/11 at 8:17am
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post #10 of 14
Thread Starter 
Quote:
Originally Posted by Xero.;13655098 
FYI, blow $15 on a Hyper 212+, my temps dropped 15-20C from stock HSF.

I am planning to but it won't fit in my current case. My intention isto buy a CoolerMaster 690 II Basic and a Hyper 212+ but i don't have the cash right now, i'd probably have it by the end of the summer. Right now i'm not playing super intensive games anyhow.

Back to underclock/undervolting i just can't believe my BIOS doesn't allow me to change the multiplier, maybe i need to flash the latest version 1702 but it's kinda risky cause i don't have a UPS. So i installed AMD overdrive, i have already reduced the Vcore to 1,230 V. Right now i'm playing some CS:S and everything seems fine atm. I hope i won't get BSOD....

I do have Cool n' Quiet enabled BTW but the ambient temperature is quite high now and i have the CPU fan on "Silent" mode which makes it spin at ~2600 rpm on idle and ~3200 rpm on load. On Standard mode the fan spins ~5000 rpm during load and ~3500 rpm on idle. My temperatures seem justifyable.
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