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CPU voltage decrease when under 100% load, Rampage IV Extreme, I73960x

GOODSHOOTER
Level 7
Hi!

When i put my I7 3960x under 100% load the core voltage decreases from 1.4 v to 1.30 v after like 30 sec.
This increase cause my system to fail and BSOD. I guess there probably is a setting in BIOS to turn this off, but i havent found it yet..
When @ 100% load the cpu temp is arround 55 degrees.
Where can i shut off this function that decreases the voltage under load ?
Rampage IV Extreme
I7 3960x
3x GTX 680 4 GB (LC)
12,728 Views
11 REPLIES 11

TenBlade
Level 11
Hi, .GS. Welcome to the ROG´s.
From 1.4 to 3.6?! You mention both decrease and increase. Could you be more specific, please. If you post all your hardware, especially RAM, that would give a better view of what your problem may be. There is a phenomenon called V-droop, which is a normal occurance of slightly falling voltage, that could be it.

TenBlade wrote:
Hi, .GS. Welcome to the ROG´s.
From 1.4 to 3.6?! You mention both decrease and increase. Could you be more specific, please. If you post all your hardware, especially RAM, that would give a better view of what your problem may be. There is a phenomenon called V-droop, which is a normal occurance of slightly falling voltage, that could be it.


Yes, i have thought that it might be v droop, how can i stop that from happening ?
Rampage IV Extreme
I7 3960x
3x GTX 680 4 GB (LC)

PlaneName
Level 10
That is very high volts for a CPU. Do you mean it increases to 3.60v or the CPU is at 3.60v and it decrease to 1.4v?

First of all, try to go into BIOS and change the settings to default. You also might do a clear CMOS on the motherboard and take out the battery out as well. Then tell us how you went.
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Been building PC's for 8 Years! 😉

TenBlade
Level 11
Thanks for the edit.
I mean, the droop is normal, shouldn´t cause BSOD, I don´t think you can get rid of it (but I´m still learning). You´re not by any chance using Corsair Vengeance memory, are ya?!

A run down or simply too cheap PSU may underperform, happened to me once. OCCT psu stress test proved that to me, my 5V line was too low, call it abnormal droop 😉 Changed from no-name brand to a well known brand, did the trick.

TenBlade wrote:
Thanks for the edit.
I mean, the droop is normal, shouldn´t cause BSOD, I don´t think you can get rid of it (but I´m still learning). You´re not by any chance using Corsair Vengeance memory, are ya?!

A run down or simply too cheap PSU may underperform, happened to me once. OCCT psu stress test proved that to me, my 5V line was too low, call it abnormal droop 😉 Changed from no-name brand to a well known brand, did the trick.


Yep, I'm using Corsair Vengeance, and my psu is a Corsair AX1200.
Rampage IV Extreme
I7 3960x
3x GTX 680 4 GB (LC)

X-ROG
Level 15
The droop is completely normal. You need to adjust your LLC (load-line calibration) to Extreme. The load-line specifically applies more voltage to compensate for this droop and in fact it's better to apply slightly LESS fixed voltage and a higher load-line level, as this way at idle your voltage and temps will be lower.

Thanks for the help guys, much appreciated !
Rampage IV Extreme
I7 3960x
3x GTX 680 4 GB (LC)

TenBlade
Level 11
If your BSOD persists, you should look at a possible replacement of the RAM, the RIVE and Vengeance RAM don´t mix well. If you search this forum you´ll find a number of posts on the issue.

Well.. BSOD still there, but i'm sure the problem isn't ram related..
The cpu just ignores my voltage input in bios right now..
whatever value i set the cpu put itself at 1.384 v in ide and 1.360 v in full load..
I have disabled all energy saving settings i could find, and i have also changed LLC to extreme, still no diffrence in the voltage displayed in cpu-z .
btw i run my ram in XMP

http://tinypic.com/r/zjjpr6/6

I would be very grateful for help with this strange problem..
Rampage IV Extreme
I7 3960x
3x GTX 680 4 GB (LC)