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Undervolt AMD Phenom II x4 965 rev 3

post #1 of 18
Thread Starter 
I want to undervolt this processor to get better temps and reduce the fan noise, which is the stock fan (really noisy).

I tried to do it yesterday. From the BIOS “MIT Section”. I set the voltage to manual, and change the vCore from 1.4v to 1.25v.

CPU-Z registered 1.232v. So I ran prime95 for 8 hours. Small FFT test.
Then I ran the large FFT and the blend tests, 2 hours each.
Every test was completed successfully. 0 errors, 0 warnings, 0 crashes.
Temps stayed at 52-54C, big difference comparing it with the stock voltage 55-62C.
And the noise was reduced also. Fan stayed at 4500RPM compared to +5600RPM before.

The problem is, that I shutted down the PC, and it didn't start. Of course, 1.25v is not enough for system startup. So the BIOS reset itself to the stock voltage.

I want to know what would be the ideal voltage for this CPU. As I'm tired of the noisy fan while I play games.

Maybe 1.3v-1.35v?
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post #2 of 18
You could probably get it stable @1.3
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post #3 of 18
Unless you're willing to seriously underclock the chip as well, I don't think the stock cooler will ever be "sane" when it comes to noise. Maybe at ~2400mhz and 1.2v? Can you live with that (crappy) performance? I'd just save up the 30 bucks and buy a new cooler.
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post #4 of 18
Thread Starter 
I've read people achieve lower voltages without sacrificing performance.

That's why I wanted an opinion from the community.

I know an aftermarket cooler will do the job, but I don't have the money.
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post #5 of 18
Quote:
Originally Posted by xutnubu;15379905 
I've read people achieve lower voltages without sacrificing performance.

That's why I wanted an opinion from the community.

I know an aftermarket cooler will do the job, but I don't have the money.

I doubt your CPU would go below 1.2v due to the 4 cores, as on the same 1.2v it is unstable as I said before try 1.3v or a little higher that should be stable.

If budget is a problem for a after market cooler than why not buy a Cooler Master Hyper Tx3 which is very nice and should be in the $20 bracket.
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post #6 of 18
I tried to do the same thing with a 955 BE. Never worked, that stock fan is just loud as sin.

If you want it quieter I'm afraid you'll have to bite down and get a cheap aftermarket cooler. Unless you want to go really extreme and underclock it too.

If you really want to try though, I only got my 955BE to 1.35 before it started erroring.
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post #7 of 18
According to AMD, the specified voltage range for your CPU is .825-1.40v. So you should be able to run it that low. The only thing you may need to do is increase the voltage slightly to your integrated memory controller (IMC).

Although as mentioned, it's never going to be truly quiet. What you need is a better cooler. This CoolerMaster Hyper 212 is an excellent choice and only $26 shipped.
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post #8 of 18
I understand about not wanting to spend money, but I bet you could post something in the "Wanted" section, you could get something in the $25 range. Maybe a H50 and then you could overclock it and have it be much quieter than your stock heatsink.
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post #9 of 18
Quote:
Originally Posted by xutnubu;15379786 
I want to undervolt this processor to get better temps and reduce the fan noise, which is the stock fan (really noisy).

I tried to do it yesterday. From the BIOS “MIT Section”. I set the voltage to manual, and change the vCore from 1.4v to 1.25v.

CPU-Z registered 1.232v. So I ran prime95 for 8 hours. Small FFT test.
Then I ran the large FFT and the blend tests, 2 hours each.
Every test was completed successfully. 0 errors, 0 warnings, 0 crashes.
Temps stayed at 52-54C, big difference comparing it with the stock voltage 55-62C.
And the noise was reduced also. Fan stayed at 4500RPM compared to +5600RPM before.

The problem is, that I shutted down the PC, and it didn't start. Of course, 1.25v is not enough for system startup. So the BIOS reset itself to the stock voltage.

I want to know what would be the ideal voltage for this CPU. As I'm tired of the noisy fan while I play games.

Maybe 1.3v-1.35v?

put it to 1.3v and run Intel burnt test 64bit with 2gb and 5 passes, if it passes, restart and lower volts couple of notches in BIOS.

Do this until IBT fails, then put it up couple of volt notches in BIOS and run ITB 10 passes same setting.

If it passes IBT 10 passes start playing your favorite demanding game, see if the computer still resets in BIOS when power on PC.

If there is still unstability you unfortunately need to keep increasing volt.

If above does not keep satisfactory results you can also consider underclocking.

EDIT--> If my memory serves me correct I did in the past 1.25v and 3.4ghz on me 965be C3, but do as I said above should be a good way to find loves volt possible.

EDIT2 --> My cpu is C3 revision, is revision 3.0 same thing?
Edited by grandpatzer - 10/20/11 at 7:34am
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post #10 of 18
Yeah, actualy you should ignore what I posted before. I'm undervolting my processor while overclocking it. I bet you can go much lower then I got.
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