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Strange vcore issue with Phenom 955 BE and M4A79T D

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November 25, 2009 1:05:23 PM

I recently put together a new machine:

Asus M4A79T Deluxe BIOS V.2205 (Open box deal from NewEgg)
Phenom II X4 955 B.E.
2 x 2 GB Corsair XMS3 DDR3 1600
Seasonic X-650 PSU
WD 320 Blue
Thermal Take Volcano 12+

I had a few problems getting the Windows 7 install to start but it eventually completed without issues. I restored all my backup files and installed a few games. I noticed that CPU-z was reading the clock at 800 mhz with 4x multi and vcore .98 whereas WCPUID correctly read the clock at 3200 mhz, but I didn't think to much of it and proceeded to fire up a game of L4D. I immediately noticed that it was running poorly compared to my last system (X2 3800+ @ 2.5 ghz). Shortly there after it crashed and rebooted. I manually set the multi to 16 and the vcore to 1.300 and then tried some stress testing with Prime95 on max FPU, it completed the first 3 iterations without fail, but I did notice that the temperature seemed surprisingly low at around 92F max at full load. While trying various RAM settings and speeds, FSB, underclocking and what not the system crashed about 5 times while browsing the web. I noticed in BIOS that the vcore was reading 1.000 volts no matter what I set the vcore setting to. I updated the BIOS to 2205 with not results. It looks like my CPU may be starving to death! :cry: 

Has anyone had any kind of similar issues; could I be missing something?

Thanks in advance.


*edit*

That was a Asus M4A79T not Asus M4A97T
a c 159 à CPUs
November 25, 2009 1:35:33 PM

Dissable the C'n'Q in the BIOS and check again.
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November 25, 2009 1:40:15 PM

Cool and Quiet is disabled.
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November 25, 2009 1:44:26 PM

saint19 said:
Dissable the C'n'Q in the BIOS and check again.


Would it make sense that at full load with a 5 year old heat sink that the core would never even approach 100*F if Cool and Quiet was the problem? I was expecting this thing to be much hotter than my old Athlon 64 X2.

I'm currently trying to run Prime95 again on it, its been running for 30 minutes so far, core temp is 91*F mobo temp 88*F...
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a c 159 à CPUs
November 25, 2009 1:52:25 PM

In the BIOS, the multiplier of the processor must be x16, the BIOS show you the x16?
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November 25, 2009 2:19:10 PM

saint19 said:
In the BIOS, the multiplier of the processor must be x16, the BIOS show you the x16?


Yes, it is set to x16 and Windows is recognizing it at 3.2 Ghz, WCPUID also says 3.2 Ghz. Only CPU-z miss reads it as 800 mhz 4x multi and also says 0.975 vcore (this is while running Prime 95), which I originally thought was inaccurate because of the other inconsistencies.



The system just locked up after 45 minutes of Prime 95, last reported core temp 92*F. RAM was underclocked.

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November 25, 2009 2:26:42 PM

Some screens.






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November 25, 2009 3:01:23 PM

I surrender.

The board is being RMA'd. :fou: 
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a c 159 à CPUs
November 25, 2009 4:11:42 PM

Try with another programs, 'cause maybe is problem of the CPU-Z
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December 1, 2009 6:14:40 PM

Just following up.

RMA'd the board and purchased a new one. (Same make/model)

It's all working fine now, I guess it appears to have been a faulty mobo / hopelessly corrupt BIOS. Makes we wonder why the previous owner sent it back, NewEgg though it was OK... Hey it powered on at-least! :pfff: 

Vcore is now right were it should be ~1.330 Volts and now the CPU actually has a temperature and is as stable as a rock.

Thanks again.
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a b à CPUs
December 2, 2009 5:08:47 AM

BTW I just built a similar system (Got it up and running today).I've had no problems whatsoever.
Using the same ASUS M4A79T Deluxe motherboard as you with a AMD Phenom II X4 955 BE CPU.
The only difference is that I am using Mushkin DDR3 1600 RAM (2 X 2GB) Model 996657 well and a different power supply (mine is 850 watts a Corsair model) and a WD 640 GB Hard Drive.
I am running Windows 7 Professional 64 bit.

Yeah I would avoid those open box deals especially the motherboards.
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December 2, 2009 1:13:44 PM

jj463rd said:
BTW I just built a similar system (Got it up and running today).I've had no problems whatsoever.
Using the same ASUS M4A79T Deluxe motherboard as you with a AMD Phenom II X4 955 BE CPU.
The only difference is that I am using Mushkin DDR3 1600 RAM (2 X 2GB) Model 996657 well and a different power supply (mine is 850 watts a Corsair model) and a WD 640 GB Hard Drive.
I am running Windows 7 Professional 64 bit.

Yeah I would avoid those open box deals especially the motherboards.



Duly noted.
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