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Quick question regarding undervolting.

post #1 of 9
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Hey guys i would not take up a lot of your time but when you are undervolting a cpu at its stock speed should i enable cool n quiet and C1E or should i keep them disabled...oh and another thing...what is a safe mosfet temperature? i currently have one of my temperature probes from me fan controller on one and it says 44.1c...am i safe or am i going to kill the board anytime soon?
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post #2 of 9
Thats pretty safe for mosfets. I've heard they can take up to 90c temperatures.

As for cool n quiet, I think you should disable it. It might cause instability if the voltage drops too low when idling? Dunno.
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post #3 of 9
I don't believe cool n quiet will reduce the voltage to an unsafe level simply because the max voltage has been changed. I don't have documentation to back this up, or time to test until this evening, but I'm fairly confident that it would not hurt. It would be fairly easy to test and find out with CPUID's HWmonitor.
post #4 of 9
Thread Starter 
Well since there is hardly any info on the subject i guess i'll do the right thing and start testing...i know with CnQ disabled the chip runs with 1.17v, i'll do some tests again and share my findings, both with stability tests i.e. prime 95 etc and also gaming.
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post #5 of 9
44.1C at idle?
That's not a good sign, but unheatsinked mosfets really do get that hot. They're usually safe running somewhat hotter than the CPU during load (optimally they should be same as CPU like in my case, 8+2 HS + 1055T 4Ghz), but they can heat up real fast.
post #6 of 9
Quote:
Originally Posted by xd_1771 View Post
44.1C at idle?
That's not a good sign, but unheatsinked mosfets really do get that hot. They're usually safe running somewhat hotter than the CPU during load (optimally they should be same as CPU like in my case, 8+2 HS + 1055T 4Ghz), but they can heat up real fast.
They can, I have one of those laser temperature guns and the mosfets can hit 45+ even being cooled by a heatsink and a small fan.

CnQ uses states. I think they go something like 800/0.9v - 2400/1.1v - max. So the max speed state is what you set in your BIOS. The lower states are predefined and entering those states won't cause instability. They're the same even if your CPU is at stock.

I think the names given to these states are P0,P1,P2.

If you want to get more info on the subject, try looking up PhenomMsrTweaker.
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post #7 of 9
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Ok guys i did some tests last night and it seems that enabling CnQ and C1E does NOT affect stability when under-volting and I did not notice any drop in temps either from having CnQ and c1e enabled or disabled.
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post #8 of 9
Quote:
Originally Posted by amd-dude View Post
Ok guys i did some tests last night and it seems that enabling CnQ and C1E does NOT affect stability when under-volting and I did not notice any drop in temps either from having CnQ and c1e enabled or disabled.
That's not normal though. Your temps should drop by a tiny bit at the least when CnQ kicks into one of it's lower power states (depends on how long it stays in that state too).
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post #9 of 9
Thread Starter 
I'm still pretty happy anyway cause at 1.15v the chip idles at 23c and load is like 28c...to bad i can't do any kind of overclock with that voltage.
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