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Calling all "Dr. House" types - Diagnose this one... - Page 5

post #41 of 68
Geeks3D: 850W psu not enough for SLI 480's stressed by EVGA OC Scanner

It may only be a sound driver, but it may be the PSU.

Quite the dilemma. Seems like a case of Acute Pneumoencephalopathy.
Edited by Mongol - 12/6/10 at 8:18am
post #42 of 68
Quote:
Originally Posted by Dunkler View Post
If this is the problem then WHY would a reboot fix it all?
No idea. But House always conducts a number of experiments first which eventually lead to the answer, so it's worth a shot.
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post #43 of 68
Your problem isn't your lack of power, that's for sure. Otherwise it'd screw up when you were running benchmarks.

It seems like it's most likely either "lupus", or a fault with the sound card/the sound card drivers, or a conflict between the sound card's drivers and the GPU's drivers.

If you can try and find a cheap PCI sound card locally (you might have one somewhere) and install that, and see if you have the same issue.

Edit: it wouldn't hurt to save your BIOS settings and reset everything to stock just to make sure that overclocking absolutely isn't the issue.

I've done that a few times to rule it out.

Quote:
Originally Posted by TCOC View Post
your PSU is junk, read post 34.

Im done with this thread, have a great day everyone, and merry chrismas!
If you're going to be so retarded, get off the bloody forums.

Corsair's PSUs are by no means "junk" WHATSOEVER (this comes from the most anti-Corsair man on OCN), the unit in question is a very high quality CWT DSG unit, and is a great performer, and is great build quality.
Edited by meticadpa - 12/6/10 at 8:14am
    
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post #44 of 68
Damn! I forgot a medical reference.. erm.. herpes
    
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post #45 of 68
There is a quick solution to this problem, Get yourself a dedicated soundcard.
It's obvious that when the system returns from a dorment state the onboard soundcard fails to initialize properly. I have the same problem with a HP small form factor pc.

I cannot believe that it's the psu that's causing this problem.
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post #46 of 68
Transverse Myelitis!!!

I could imagine an OC'd i7-950 and OC'd 2x GTX480 pulling very close to 850W, if not slightly more (~50+W). A quick search of 2x GTX 480 isolated power consumption comes up at 600-650W (link is of stock clocked engineering samples... driver and firmware updates create some variance). The i7-950 has a TDP of 130W (some link, power consumption was not isolated from mobo or idle GPU). We can say that your motherboard and everything else draws 60W conservatively. Already, that is ~800-850W without overclocks. Now imagine what happens to power consumption when those components run at speeds above their rated spec with volt mods. I'm not by any means an electrical expert, but I could imagine your sound issue and eventual crash being caused by electrical noise (increasing over time?) from your PSU, OR just a simple build-up of heat in the PSU inducing poorer performance and creating more noise/ripple. Alternatively, the degrading sound issue could be caused by an accumulated electrical charge somewhere that is discharged when you reboot your PC. Those are my first hypotheses at my current level of understanding.

Some anecdotal support... As I was sifting through the PSU section a while ago, I recall Phaedrus, our resident PSU guru, mentioning the GTX 480's "poor scaling" with regard to power consumption when overclocking, possibly SLI as well. Also, I came across this excerpt which you will find very relevant:

Quote:
Originally Posted by GTX 470 - GTX 480 - GTX 480 SLI Review at HardOCP
With a nicely overclocked Core i7 920 processor (3.6GHz) and GTX 480 SLI, we saw at the wall wattages exceed 900 watts at the wall in some very stressful GPU system situation.
Since they measured the power draw at the wall, however, then your HX-850 might only be working with 756W (900*.84 @100%), and it should be capable of 1016W vAC "at the wall." So there's that to consider too.

I would first see turn off your GPU OC's completely, then remove your CPU OC/reset BIOS, then revert back to single GPU configuration.
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post #47 of 68
Thread Starter 
OK, this is what I have come up with to diagnose this problem.

I can

A) Take both GPU's and CPU back to stock clocks and retest
B) Disable GPU 1 and retest
C) Disable GPU 2 and retest
D) Say screw it and just reboot when the problem occurs
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post #48 of 68
Whiteboard:

Patient performs benchmarks with no issue
Patient plays games with no issue
Patient acts fine until waking from sleep cold boot
After waking cold boot, sound quality is negatively affected until reboot.
[warm] Reboot solves problem

If the "crap" PSU were the problem, it makes sense that it would reproduce the issue during benches or games or other high demand activities.
Before we "solve the problem" with a new Diablotec PSU, let's try the conservative diagnostics suggested first.
Edited by Aardobard - 12/8/10 at 7:42am
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post #49 of 68
Heat/uptime making a difference suggests that perhaps some component is generating a lot of EMI after a cold start, and when it heats up it generates less.

It's probably affecting something in your motherboard, maybe the buses - because it affects several components but that doesn't seem like EMI could affect so many components so severely.

Try removing one card, downclocking to stock (and downclocking the remaining GPU to the absolute minimum)... even if it's not EMI, it's probably something to do with your motherboard - maybe it can't handle the load or it's just bad and breaks under load.

You can't really tell what it is unless you start testing parts individually. If it's not EMI, it could be your motherboard, but you have no way of knowing until you try a different motherboard.
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post #50 of 68
Thread Starter 
I may have screwed up. I just now saw that you guys are thinking the computer is having this problem when it wakes up from a sleep mode, which it is not. What I meant by dormant was actually - while the computer has been turned off for a while. I am sorry for this confusion, I have edited the OP to reflect this.
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