How does a vdroop mod affect temps?

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DaBuddMon

Limp Gawd
Joined
Jan 18, 2003
Messages
254
I am considering doing the vdroop mod on my Asus P5E-VM HDMI mobo. As it is (without the vdroop mod), when I set my voltage to 1.35 in the BIOS, when the CPU is idle, it reports and actual voltage of 1.32, and on full load it reports the voltage as 1.27.

My question is - if I do the vdroop mod and put my voltage at say 1.32, will my temps increase as a result of the voltage remaining higher when the CPU is on full load? Right now I have my E8400 OCed to 3.7GHz at 1.35vcore, and being in a SFF case my cooling options are limited and temps are already at a high enough point on full load that I don't want to raise the vcore anymore. Will doing the vdroop mod allow me to raise my OC higher on a lower voltage and possibly lower temps or at least keep them the same?

Thanks for any info.
 
If the voltage is higher (ie hasnt drooped as much), temps will be higher too.
You should be able to set a slightly lower Vcore and still remain stable under load.
 
Well I am wanting to hit 4GHz, but as it is my temps go a bit too high at 4GHz, so I'm wondering if the vdroop mod would somehow level that off (say if at 4GHz on full load, my voltage lowers to 1.32, so then I set my voltage to 1.32 after a vdroop mod instead of a higher setting in the BIOS which I have to do right now as a result of the vdroop my mobo suffers from).
 
A vdroop mod will not affect your temps, at all, save possibly lowering idle temps just a bit... which is not that important. It is not meant to resolve what you want it to resolve.
 
What about "Loadline Calibration" or "Voltage Damper" in the bios? Don't those disable vdroop, or at least reduce it? I know a lot of the new ASUS boards have it. I've been using Loadline Calibration to remove my vdroop, seems to do the job...
 
silent-circuit said:
A vdroop mod will not affect your temps, at all, save possibly lowering idle temps just a bit... which is not that important. It is not meant to resolve what you want it to resolve.
Click to expand...

Agreed.
To attain a certain clock speed you will need a certain voltage regardless of how you apply it.
That voltage will always generate the same amount of heat so there wont be a difference in temperature.

Modifying Vdroop wont help your load temps, only idle temps.
 
Ok, so I guess I just need a better cooling solution for my E8400.

On another note, I may just do the mod so I have more accurate voltage readings, esp between full load and idle, and to lower my idle temp a bit. The ASUS board has a voltage damper option that supposively should eliminate vdroop, but it doesn't seem to work at all. Perhaps a future BIOS update will resolve this...
 
DaBuddMon said:
Ok, so I guess I just need a better cooling solution for my E8400.
Click to expand...
lol yes :)

Try using an umbilical hose from a clothes dryer to either feed cold air to the heatsink or take the hot air out of the case.
I used to draw cold air in with my lesser heatsinks but with a TRUE 120 I havent got the space for any hose, doh!
It makes a big difference but you will likely need to cut a hole in the side of your case.

ps the voltage readings are not guaranteed accurate, they are only a guide.
I wouldnt get fanatical about them :)
 
Another question.

I've read that many people are having problems getting an accurate temp reading from their E8400, and I believe I am seeing this as well. RealTemp reports my cores at 55 -58 degrees on full load while the mobo reports around 63 degrees. Everest reports the cores around 70 degrees, so I am confounded as to which metric I should trust (I don't believe I'm hitting 70 degrees though, that's just ridiculous). What should I be using to get an accurate reading? If my cores are really at 55-58 on full load then I may have some small headroom to push the OC a bit higher (maybe not 4GHz, but possibly 3.8GHz).
 
Realtemp will give you the closest result and you can compensate for low/high idle readings if it bothers you.
Higher temps are likely to be more accurate because all the chips are calibrated to report correctly when they reach TjMax.
UncleWebb wrote Realtemp because he was unhappy with the reported temps so made his own tool and calibrated it to be more realistic.
The new 45nM chips report the temp and TjMax about 10C too high so UncleWebb compensated for that too.
 
Thanks for the reply. Then I do have a little bit of headroom it seems. For a SFF I don't think 3.7GHz is terrible by any means, but why not go the extra mile if I have the ability to? ;)

Thanks for the replies and help everyone. I'll see if I can eek out a tad more performance on this chip without blowing it up. :D
 
cool :)
Try to stay 20C or more under TjMax to give yourself some headroom for hot days.
Test for stability on a warm/hot day or equivalent temp.
 
No worries Nenu. I do my stress tests in a 78F degree enviornment and let it run for 5 hours straight. Not that my room ever gets that hot, but you never know...
 
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