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Phenom 955 be voltage

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  • CPUs
  • Phenom
  • Overclocking
Last response: in Overclocking
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June 26, 2011 8:20:08 PM

I have a question about my cpu voltages, but first here are my system specs:

Antec 1200
Asus M4A89GTD PRO/USB3
Phenom 955 BE 3.2ghz
Thermalright Venomous X-RT
G.SKILL Ripjaws X 2x4gb 1600mhz 9-9-9-24 1.5v
Intel 510 120gb SSD
GPU is onboard for now.
Win 7 Ultimate 64bit

I have set Ai overclock tuner to manual, multiplier x20, fsb is 200. I down clocked my ram to 1333mhz and tightened the timings to 7-7-7-21 @ 1.5v. I set the CPU & NB voltage mode to Manual and set my CPU voltage to 1.4125v. Every other voltage I left on auto. Now when I boot into windows, CPU-z, hw monitor, pc probe all show my voltage as being 1.440v. My oc passes after 4.5hrs prime95 (or should I run longer). So I guess my question is, why this discrepancy? Is it because I left all the other voltages on auto? I disabled cool n quiet and C1E. Also, why the discrepancy in temperature difference as you see in the screenshot, hw monitor says my temp is 46C, pc probe says it is 45C, However in the bottom right is Core temp and it reads 52C. Should i trust Core temp or is pc probe and hw monitor more reliable? Any help would be much appreciated. I have tried to include as many details as I can think of that would help. Just ask if any more info is needed.

Ram settings and timings:
http://i672.photobucket.com/albums/vv82/dm2017/photo.jp...

CPU Voltage settings:
http://i672.photobucket.com/albums/vv82/dm2017/photo-1....
http://i672.photobucket.com/albums/vv82/dm2017/photo-2....

Screenshot:
http://i672.photobucket.com/albums/vv82/dm2017/stresste...






More about : phenom 955 voltage

a c 139 à CPUs
a c 242 K Overclocking
June 26, 2011 10:52:26 PM

Your cool n quite / C1E still / Power Now still enabled. You must disabled it. and about vcore, you must do it in bios sellect auto voltage by manual.
1.42v -1.45 you can get 4ghz with good after market cooler. Don't let cpu voltage in auto if overclocking.
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June 26, 2011 11:18:13 PM

Cool n quiet is disable c1e is disabled. Not sure what "power now" is ill check that to. An my adjustments are made via the bios as shown in the pictures. As far as i can tell this is stable however my question was about the difference in voltages and temps. In bios voltage reads 1.4125 in windows it reads 1.44. And the temps i have 3 different readings from 3 different programs. Again this is not a question of stability but of discrepancies. Thankyou for you input.
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a c 139 à CPUs
a c 242 K Overclocking
June 27, 2011 2:17:39 AM

In bios voltage reads 1.4125 in windows it reads 1.44 = it called vdrop
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June 27, 2011 3:51:52 AM

So ive researched vdrop and from what i gather, vdrop is when software displays lower voltage when idle, than what the bios indicates. I seem to have the reverse. Bios says 1.4125 cpuz indicates 1.44 under 100% load and 1.41-1.42 when idle. So i get that it is drawing more voltage when under load, does this matter? How do i change it so it stays at one voltage? Can i?
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a c 139 à CPUs
a c 242 K Overclocking
June 27, 2011 4:10:25 AM

No this is different ....
1.44 under 100% load and 1.42 when idle and then fulload 100% again show 1.40v ... this called VDROOP

VDROP = Compare the voltage for the CPU-Z with voltage in BIOS. all motheboard have VDROP , So as long as it is less than 5%, is pretty much OK for everything except extreme benchmarking (wherein even a 0.05v change may kill an overclock!
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June 27, 2011 6:11:28 AM

Well i think i understand i guess if im at 4ghz i am lucky especially at 1.44v although id prefer 1.4125. However that doesnt explain the temperature differences. Should i believe pc probe and hw monitor because they coincide with each other or should i believe core temp which shows a 7C higher difference?
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a c 139 à CPUs
a c 242 K Overclocking
June 27, 2011 6:21:17 AM

i believe hw monitor .. i don't use core temp .. you can see in bios not use core temp but CPU temp
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June 28, 2011 3:45:06 AM

Best answer selected by Drock2017.
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June 28, 2011 8:23:30 PM

Someone tell me why the hell you have to disable cool&quiet? It's saves a tons of electricty.
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June 28, 2011 10:26:35 PM

Nobody says you HAVE to disable cool n quiet. But if you plan on overclocking it is a good idea for a few reasons. First, some people have claimed it hampers your stability. When overclocking you want to eleminate as many possibilities as you can for instability. Second, it can skew your stability test results from what i have read, and you want to make sure your OC is stable. In my case cool n quiet is automatically disabled when i bring my multiplier above x18 so i cant even enable it if I wanted to. My multiplier is at x20. I am sure there are other reasons but i hope this sheds some light on your question. If ypur overclocking i doubt your all that worried abiut energy efficiency anyways.
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a c 131 à CPUs
a b K Overclocking
June 28, 2011 11:54:44 PM

edgaraslt said:
Someone tell me why the hell you have to disable cool&quiet? It's saves a tons of electricty.


You don't ... but C&Q does not work properly when the CPU multi is raised above stock in BE CPUs. There are third-party utilities, however, that allow you to do so.

And if the OP were so inclined he could easily run 16x250MHz / 4x250MHz in C&Q with his RAMs at 5(.)33x250.

In addition to allowing C&Q, this would significantly increase memory bandwidth and reduce latency by running the IMC/NB at 2500MHz from stock 2000MHz. Should be easy enough with the NB volts at 1.1875v to 1.2v.

For each 10% increase in IMC/NB speed, memory bandwidth is increased 3-4% and latency is reduced 3-4%.


edit: I fergit.

C&Q doesn't really impact your OC headroom or stability, or, never has really held me back. I think this is an old tale from the Socket A // s939 days that has carried over for 5-6 years.


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June 29, 2011 1:05:46 AM

Very informative thank you. I was going by what ive read. I am knew to overclocking and was playing it safe by adjusting only the multiplier. I will in time play with the bus and nb freq. Etc.
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a c 139 à CPUs
a c 242 K Overclocking
June 29, 2011 2:41:37 AM


in a high overclock if CnQ still enabled then when a
test of stability can cause vCore will jump up, what
would happen if the psu can not provide for power
and more so the temperature will rise rapidly, this
will harm the hardware. if only doing a small oc can
You can enabled it. like the default 3.0GHz to 3.2GHz still worth but depend system.
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