c2d @ 0.9v!

S

SuperKeijo

Gawd
Joined
Jan 18, 2007
Messages
705
Hi!

I just figured how insanely much a core 2 duo undervolts! I have an e4300 and it is absolutely stable with stock speeds and a 0.9v core voltage. With these settings torturing the thing with TAT @ 100% load the temps go to a max of 46 degrees centigrade and idle temp is just 36. With the processor running at 3.3 GHz and voltages of 1.5v TAT temps go over 80 degrees.

I guess that just makes you think twice before cramping up the cpu speeds above 3GHz and burning the crap out of the processor. It just runs so insanely cool with 0.9v and 1.8GHz so kind of hurts to put it back to over 3 and run it 30 degrees hotter!

The point of this thread? not really sure... just thought i'd share this with you :)
 
That would be a DREAM for an HTPC setup... nice and cool running and low power too. :)
 
SuperKeijo said:
It just runs so insanely cool with 0.9v and 1.8GHz so kind of hurts to put it back to over 3 and run it 30 degrees hotter!
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i think you need to invest in a better heatsink. i can fun an fx-55 at 800mhz, 1.0v with no heatsink at 33c idle, 55c load. it's a mere 10w at load anyway... :p



though stock speed with 0.9v is damn impressive.
 
Yeah my max temp after running 100% for a long time is ~40c, and thats @ 3ghz 1.2something volts. Good to know it can run that low though :)
 
(cf)Eclipse said:
i think you need to invest in a better heatsink. i can fun an fx-55 at 800mhz, 1.0v with no heatsink at 33c idle, 55c load. it's a mere 10w at load anyway... :p



though stock speed with 0.9v is damn impressive.
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I'm sorry mate, but you just cannot compare the readings of an amd fx-55 processor and intel c2d. Besides, you have 1000MHz less and only 0.1v more voltage and still nearly 10c more temps, so how do you make the conclusion that I have a bad heatsink? AND the fx-55 is singlecore? so I'm guessing 1 core should produce less heat then 2?

edit. OK it wasn't until now that i read NO HEATSINK, so..... forget it :D

jmackay said:
Yeah my max temp after running 100% for a long time is ~40c, and thats @ 3ghz 1.2something volts. Good to know it can run that low though :)
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What do you use for stressing the cpu and reading temps? and what cooling? It can't be air?
 
Air, Thermalright Ultra-120 w/ a Yate loon fan on it. Antec P180 case with the normal antec fans + another yate loon in the front. Antec fans are running @ medium setting (might swap them out with 2 other yates).

Use Orthos, OCCT, 2x folding, and TAT for temp checking. TAT runs ~3-5c higher than any other program. I think someone said it activates everything on the cpu vs using it for 100% workload which would explain why its higher.
 
SuperKeijo said:
edit. OK it wasn't until now that i read NO HEATSINK, so..... forget it :D
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yup, sorry if i pissed you off for a minute there.

undervolting is great fun. great great fun :D:D

now, how far above stock mhz can you get at 0.9v?
 
You really should have much lower temps at only 0.9v....

I have an Opteron 175 (dual core)... at stock speeds and volts it runs a lot cooler than what you are running at 0.9v.
 
(cf)Eclipse said:
i think you need to invest in a better heatsink. i can fun an fx-55 at 800mhz, 1.0v with no heatsink at 33c idle, 55c load. it's a mere 10w at load anyway... :p



though stock speed with 0.9v is damn impressive.
Click to expand...

Eclipse, question for you.

Do you know the estimation-equation that relates wattage to clockspeed and voltage? I know it's the square of something :p
 
cyclone3d said:
You really should have much lower temps at only 0.9v....

I have an Opteron 175 (dual core)... at stock speeds and volts it runs a lot cooler than what you are running at 0.9v.
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Well, as I did state before, it is pointless comparing these temps. You'd have to have a core 2 duo and TAT to compare temps. You obviously aren't aware of the temp reading "issues" with core 2 duos, as nearly all programs give different temps. If I look at what easytune 5 says, which gives the same results as bios, the temps only go to 30c on full load and 26 on idle (and the room temperature wasn,t much under that 26), so you could just as well compare your temps to that. People you have core 2 duos (at least the e4300) and have tried running TAT full load will tell you it isn't easy going under 60c no matter what the cooling. Orthos running the small FFT doesn't get the processor nearly as hot as TAT.


(cf)Eclipse said:
yup, sorry if i pissed you off for a minute there.

undervolting is great fun. great great fun :D:D

now, how far above stock mhz can you get at 0.9v?
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Well to be honest, I did finally get an error running orthos at 0.9v. TAT was perfectly stable so I thought everything was fine, but with orthos it apparently wasn't. 0,9125 seemed very stable in orthos too, so with 0.9v not really anything above stock speed. I did try running it at 1.2GHz and 0.7625v! This time TAT reads 35 idle and 38 full load. Easytune 5 read 25 idle and 27 full load! Not too much jump from idle to load temps :)
 
woo i thinks i beats ure cpu temp wise, 27 c idle 35 load at 1.39 volts oced to 2550 mhz

edit: those temps are with the TT golden orb 2 (everybody says it sucks)
 
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