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PC&C 1k sr defective?

M

magik20

[H]ard|Gawd
Joined
Jun 10, 2002
Messages
1,241
My PC specs are as follows

i7-3930k OC @ 4.5
32 GB Ram @ 1600
1k PSU PCPower&cooling
http://www.pcpower.com/power-supply/turbo-cool-1kw-sr.html

x2 7950's using 13.9

When running FurMark, my PC resets. Watching the log from GPU-Z, it seems the VDDC is pulling 130+ (I am assuming this is amps?)

The PSU is rated for 75-80 amps, on the single rail.

Is this the reason that my PC restarts? Am I drawing too much amp from the 12v?

In terms of Watts, this PSU should be enough for dual 7950's and my CPU?
 
It should be more than enough.

Either it's defective (not putting out enough stable power), or you have another problem somewhere else.

An 850 watt power supply should be enough for your system. If you have a spare one lying around, I would suggest swapping it in. Things like this, you just need to test one component at a time to isolate the problem.
 
I just hooked up a 650w psu to one of the cards and jumped it.

using the 1k watt psu to power the other 7950 and the mainboard

it ran through furmark and valley fine.... I guess this psu is defective or can't handle the 100+ amp requirement that both cards need?

I opened up a ticket with pc power and cooling
 
Those cards are not pulling 100 amps on the 12v rail. That's impossible. 100 amps on 12v means 1200 watts, so you're basically saying each card is pulling 1200 watts. VDDC stands for voltage, presumably voltage to the core, and most likely an offset voltage in millivolts. So basically, it just means its set to add 130 mv to the stock voltage setting.
 
This article suggests that they pull about 135 watts each....and they recommend a 750 watt PSU for 2 cards....

http://www.guru3d.com/articles-pages/radeon-hd-7950-crossfire-review-2-and-3-way,5.html

This is interesting though, and may explain what you are seeing.

Note: For our power consumptions tests we no longer use FurMark as stress test. Furmark is very malicious on the GPU, so malicious that it does not represent an objective power draw compared to really hefty gaming. If we take a very-harsh-on-the-GPU gaming title, then measure power consumption and then compare the very same with Furmark, the power consumption can be 50 to 100W higher on a high-end graphics card solely because of FurMark.
Click to expand...

our own review also backs up the wattage claim..

http://www.hardocp.com/article/2012...lack_edition_video_card_review/9#.Uki2mRDTBr0
 
magik20 said:
im using GPU-Z

Under "VDDC Current" it reads over 100 A during benchmarking.

Am I assuming correcting that "A" is amps and if so, the cards combined are pulling over 100 amps?

Heres the GPU-Z log file

http://privatepaste.com/9c27df4887#
Click to expand...

Look at your VDDC reading all the way on the right side, and that gives you the voltage that current is running at.

Your highest VDDC Current reading (that I could find in a quick scan) is 124 A, corresponding to a VDDC Voltage reading of 1.08 V. 124 * 1.08 = 134 watts. 134 / 12 = 11.16 A being pulled on the 12 V. Adding the other components on the card (memory, etc), you're looking at a max of ~14 A, or 168 watts. Two cards would be 330 watts max, and there's no way the rest of your system is sucking down 700+ watts.
 
Tsumi said:
Look at your VDDC reading all the way on the right side, and that gives you the voltage that current is running at.

Your highest VDDC Current reading (that I could find in a quick scan) is 124 A, corresponding to a VDDC Voltage reading of 1.08 V. 124 * 1.08 = 134 watts. 134 / 12 = 11.16 A being pulled on the 12 V. Adding the other components on the card (memory, etc), you're looking at a max of ~14 A, or 168 watts. Two cards would be 330 watts max, and there's no way the rest of your system is sucking down 700+ watts.
Click to expand...

Yea I would have to totally agree

there is something wrong with this PSU, only answer I can think of.

I'll try to RMA it and order another one in the mean time. Thank you
 
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