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850 Unit not enough? - Page 3

post #21 of 28
Do you have another psu? If you do maybe you could plug one of the cards into the 2nd psu and test to check if it freezes.
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post #22 of 28
Thread Starter 
Quote:
Originally Posted by Xeoc;14249798 
Do you have another psu? If you do maybe you could plug one of the cards into the 2nd psu and test to check if it freezes.

This would rule out the power issue? Good idea. How do i do it? Turn the PC on then jump start the second PSU as quick as i can?
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post #23 of 28
I had this same question a while back when I was running SLI GTX 570s on a 650w PSU. I had some instability which I thought to be due to inadequate power. I was quickly set straight by some PSU experts that mentioned that if you ever attempt to draw more power from a PSU than it is rated for you'll just hit over current protection (OCP). This feature is built in to PSUs. It will just shut down your computer.

I also asked around if being at or near the limit of power on the PSU could cause instability like what you mentioned. I had several BSODs too, but I think the general consensus was that if you hit the power limit all that will happen is your computer will shut down (PSU hitting OCP).

A simple way I tested was by running LinX and furmark and bam my power shut off. NO BSOD at all, therefore I think the BSOD you get is from instability in your GPU or CPU either with drivers or overclock. All that should happen from not enough power is a straight power off or restart--no BSOD.

Hope this cleared things up. Again I don't think its the PSU.

Also I'm running gtx 580 SLI on the same PSU haven't had any issues.
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post #24 of 28
Thread Starter 
Quote:
Originally Posted by h2beez;14250079 
I had this same question a while back when I was running SLI GTX 570s on a 650w PSU. I had some instability which I thought to be due to inadequate power. I was quickly set straight by some PSU experts that mentioned that if you ever attempt to draw more power from a PSU than it is rated for you'll just hit over current protection (OCP). This feature is built in to PSUs. It will just shut down your computer.

I also asked around if being at or near the limit of power on the PSU could cause instability like what you mentioned. I had several BSODs too, but I think the general consensus was that if you hit the power limit all that will happen is your computer will shut down (PSU hitting OCP).

A simple way I tested was by running LinX and furmark and bam my power shut off. NO BSOD at all, therefore I think the BSOD you get is from instability in your GPU or CPU either with drivers or overclock. All that should happen from not enough power is a straight power off or restart--no BSOD.

Hope this cleared things up. Again I don't think its the PSU.

Also I'm running gtx 580 SLI on the same PSU haven't had any issues.

That's very interesting, thank you. What i still don't understand is that why am i stable when running CPU and GPU's on their own however in game were they are both needed i get the blue screen? I just don't get it?

A game would use 200w from both 6970's = 400w, 200w from CPU at most = 600w + 50w for other stuff = 650 in game?
Edited by BradleyW - 7/17/11 at 4:27pm
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post #25 of 28
Can't say much about the instability coming from GPUs as I have been on Nvidia all my life but a simple way to put your power worries to rest is to invest in a Kill-a-watt meter.

[ame="http://www.amazon.com/P3-International-P4400-Electricity-Monitor/dp/B00009MDBU"]Amazon.com: P3 International P4400 Kill A Watt Electricity Usage Monitor: Home Improvement[/ame]

Other people on here probably know places to get it for cheaper. I've seen it for as low as 12 dollars. Very useful. Just keep in mind that your hx 850 is an 80 plus silver so, if I recall correctly, its rated at 85% efficiency from the wall.
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post #26 of 28
Quote:
Originally Posted by BradleyW;14248356 
If i play a game in CF i crash. If i run CPU stability test then the overclock is fine. If i run furmark burn in test the system is fine. If i run them together i get a freeze up, blue screen ect.

This made me think it's a power issue but then again, the issue is also in game? I don't understand. It makes no sence. Everything tests out fine on it's own. When it's all together, the system does not work.

Also Prime95 shows 7 workers only although i set it to 8. Task manager shows all 8 threads.
Plus, if i drop to 4GHz on the CPU, i have no issues at all. Then again, 4.4GHz has been fine til now. I've reformatted to get rid of software conflict.

Please help.

def. not enough case of not enough power. if you saw my test data in phaedrus's thread i overvolted my gpus a bunch and could just barely hit the max of my power supply (also 850w) running OCCT.

Trying running intelburntest instead of prime95, it seems to be a bit more stressful.

also you can download a program called bluescreenview to tell you exactly what file caused the BSOD.

only other thing that comes to mind is maybe the overclock isnt stable anymore. When my overclock wasnt stable the only game that gave me issues oddly enough was BC2 (and it would BSOD during intelburntest)
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post #27 of 28
So running with just 1 card yeilds no BSOD?

Just out of interest what overclock do you run on your cards? voltage/clocks?
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post #28 of 28
Thread Starter 
Just ran furmark with prime95 with the 11.6 hotfix B drivers. No Bsod. I think the issue is resolved.
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