PSU issue (I think?)

pENdr4gON

pENdr4gON

pENdr4gON

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Joined
23 Nov 2007
Posts
48
Location
Pompey
I built a system a month back and I have been plagued with crashes. I have been pulling parts,testing, swapping parts and testing, changing BIOS settings and testing...

Crash description: Power off like someone has pulled the plug. The PSU has a feature that the fan will continue to run for 120seconds. The computer will not restart until the power has been unplugged for half a minuet. Then she starts without error, just Win7 complaining about improper shut-down.

I have now got to the point having the computer stable or unstable on one setup change. Run in crossfire and it will crash, just one card and it's OK.

I have tried every RAM configuration possible. Swapped out the CPU, changed the Heatsink (contact block too small!) Run it on one G/Card, swapped to the other one. Added extra fans, she now sounds like a hoover!

As each G/Card is fine on it's own I sort of figure that it must be the PSU tripping under load.

It's defiantly one card good, two cards bad...

System spec:
NOT OVER CLOCKED!
Case: CM Storm Scout (Extra side fans)
CPU: AMD PhenomII Hex 1090T Black
RAM: 2x G.Skill Ripjaw 4GB 1600MHz RAM Speed, CAS 9-9-9-24 Timings, 1.50 -1.65v VDIMM (8GB in Total) (under-clocked as there are four sticks)
Motherboard: ASUS CROSSHAIR IV FORMULA
G/Cards: 2xATI 6870 Powercolor
Drives:
CD/DVD Burner
Intel SSD 80Gb
250Gb + 500Gb drives​
Fans:
4x120mm 1x140mm 1x80 (directional in the case pointing at he NB chipset cooler)​
Monitor: ViewSonic VX2260W
​
PSU: 850W http://www.highpowerplus.com/850.htm I was assured it would be enough and with 4 12V rails would be stable enough.

I guess my first question is, am I right to suspect the PSU? If it is can someone suggest a replacement?

I'm just about spent out getting to this point and I'm going to have to run one G/Card till I can save up for a replacement PSU.

When she's running it's as sweet as a nut, just about as fast as I could want. Because of this issue I have not been able to play with overclocking yet but it should be good for some nice figures. If only she would run without powering off at random times!
 
I know I know it's like never buy cheap paint... but money was tight. As for the RAM I have been down that road. It took best part of a week to eliminate the RAM from the equation. Different BIOS settings and physical configurations. The crash is almost random. Sometimes it can go several hours of game play before she goes. You think you have it sorted and pop! she has gone again. This is why I have been at this for over a month.
 
Yes but not in Crossfire as you need two of the same generation. So I have tested a different graphics card and each of the 6870's if there is just one card or both but crossfire not enables the computer is stable. If crossfire is enabled and then put under load by playing a game she will go.

PS congrats on the 1000'th post!
 
pENdr4gON said:
Yes but not in Crossfire as you need two of the same generation. So I have tested a different graphics card and each of the 6870's if there is just one card or both but crossfire not enables the computer is stable. If crossfire is enabled and then put under load by playing a game she will go.

PS congrats on the 1000'th post!
Click to expand...

Thanks, hope it works out for you.
 
Almost definitely a PSU problem. Still entirely possible it's a motherboard issue, but much less likely, especially with a quality board like that.
 
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