PSU 12V Rail Low

Solaris

Solaris

Solaris

Associate
Joined
31 Oct 2006
Posts
2,004
So I put together a new rig (budgeting myself quite a bit) this week.

The parts arrived, I built it, it runs fine.

Now and then (only during gaming so far) it reboots. No error messages, nothing in the logs, it just reboots.

I've been watching the voltages whilst gaming for the last hour and at times the 12V Rail fluxuates really heavily when the computer is loaded (getting down as low as 11.215V.

Do you think low voltage could be causing the reboots? Or am I just being paranoid?
 
EVGA GeForce GTX 660 Superclocked 2048MB GDDR5 PCI-Express Graphics Card
AMD Piledriver FX-8 Eight Core 8350 Black Edition 4.00GHz (Socket AM3+) Processor - Retail
Asus M5A99X EVO AMD 990X (Socket AM3+) DDR3 ATX Motherboard
OcUK Swift 750W V2 Silent Power Supply
2x Corsair XMS3 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMX8GX3M2A1600C9)
 
I think the psu is not up to the job....no matter if it is a 750watt.....got some nice kit there but the psu is letting you down...imho
 
what you using to measure the 12v rail voltage? SOftware can be known to take false readings so to be 100% sure if you have a multimeter handy take the 12v reading from the 24 pin plug with a game running and see how it reads.

Does sound like a PSU issue tho going by random reboots when doing intensive taks like gaming
 
100% psu mate
get rid pronto and get a seasonic/corsair/xfx like butonz said.
That psu may be able to peak 750w but theres no way under pressure it could sustain it stable.
 
You have essentially bought a Ferrari and put a Lawnmower engine in it :p
Like everyone else has said, you should change it for a well known brand.
 
So, I was just using the computer for some work stuff (don't really have a choice, I'm an on call systems administrator that needed the computer to VPN into work) and bang (literally) and the computer turns off...

Try to turn back on and the Mobo has LEDs showing on it, but no activity...

Get out the multimeter and the 12V rail is now showing 0V...

OcUK Swift 750W V2 Silent Power Supply - Lifespan <1 week...

Lesson learned, don't cheap out on the PSU...

Because I didn't have a choice as I really need the computer for work... Had to fork over money to the Purple Shirts for a new Antec PSU... Sad day...
 
Always, always build a pc around a well known quality branded psu, Corsair,BeQuiet, Antec, etc.
Never use generic psu's, you can & will mostly likely will end up with an expensive bill, replacing motherboard,etc when it fails & takes out other parts.
 
Yeah, luckily this time there was no collateral damage. Board, CPU, GFX, Disks, etc all look fine...

Just watched the voltage during a game of BF3 and didn't dip below 11.943... Big improvement.
 
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