Desktop randomly shut down

Ro4x · Jan 15, 2014

Hello,

I've been building PCs for a long time and never had a problem I could't solve yet. Now I have one that drives me crazy.

I've been building 2 scryptcoin miners with identical hardwar for a custommer. The hardware per case: AMD FX 4300, 2x Sapphire 7950 GPU, ASRock 970 Extreme3 R2.0, simple HDD with debian 7.3, 4GB ddr 3 RAM, Corsair CX750, 750 Watt PSU.

Both of the desktops also show identical problems. They randomly shutdown. When they shutdown I have to hardreset the PSU. If I do not hard reset the PSU I cannot boot the desktop. I thought it was a PSU problem so I replaced the PSU of one desktop with a 850 watt. Still exact same problem. 750watt must be more then enough for 2x 7950.

The problem occurs totally random. Can be after 6 minutes from boot. Can be 12 hours from boot.

Any ideas on this?

EDIT: added Mobo and PSU models

C12Friedman · Jan 15, 2014

Although a quality 750W+ PSU will easily run that system, many PSU's are not quality units and many PSU's also overstate their capabilities. Tales abound about that - see here http://www.hardwaresecrets.com/article/Coolmax-CUL-750B-750-W-Power-Supply-Review/977/10 (linked to conclusion page)

What PSU(s) do you have there?

Ro4x · Jan 15, 2014

Thanks for your reply. I've had heard about that before. That's the reason I will never go for the cheapest PSU for a x amount of watt. I'm using a
Corsair CX750, 750 Watt PSU.

I must say that one of the two PSU smell burned. That's the one i swapped out for the 850watt PSU from powerzone. But still the same problem.

C12Friedman · Jan 15, 2014

The Corsair PSU shouldn't be the issue (at least I wouldn't think so), what about the motherboards? What make/model.
Do you have any known problems with your power from the grid?

Ro4x · Jan 15, 2014

The motherboard is a ASRock 970 Extreme3 R2.0. I couldn't tell all the models since I wasn't at home when I wrote this. Any ideas?

C12Friedman · Jan 15, 2014

Are the graphics set up side-by-side or in crossfire, if in crossfire are one or two bridges being used?

Ro4x · Jan 15, 2014

Side-by-side.

Ro4x · Jan 15, 2014

Currently i'm installing Windows 7. Just to be sure that it's not Debian.

C12Friedman · Jan 16, 2014

In re-reading this (and pondering much), I'm considering whether the ASRock mobo's aren't the issue here - I'll suggest running GPU-z and checking the voltages (12v notably) being reported in the sensors tab - might need to alter some PCI or northbridge voltages

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Desktop randomly shut down

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