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Odd 580 SLI Problem

post #1 of 27
Thread Starter 
I just finished installing a second GTX 580 (vanilla) last night along with a HX1000 to power everything.

I can play Dirt 2 for extended periods without hassle (doesn't fully utliize both GPUs due to vsync) but when I restart the computer while the cards are still hot it hangs during the POST and doesn't provide signal to my monitor. In order to get the system back up and running I have to flip the main switch of the PSU open and then closed.

When the cards are at idle temperatures I don't seem to have this problem.

Also, considering the sort of odd nature of the HX1000 and it's two fully independent 12V rails I might have things hooked up wrong. The hard wired PCIe leads run from V2 along with the peripherals while the core system runs from the V1. I have the second GTX plugged into the V2 rail using the modular connections but I'm not sure if that is ideal. Both GPU's are then running from the 500W 12V2 rail which may not be ideal.

I also know that if a GTX 4xx is not properly connected to power it will produce the same result; a video-less post with the system seemingly hanging with the GPU fans wound up.

Does this sound like a power supply issue or could there be something else preventing the system from booting properly? If this is a power supply issue should I move one of the GPU's over to the 12V1 rail to balance to load a little more effectively?
post #2 of 27
I suggest that 1 card you run from V1 connectors and second card from V2 connectors.
The system and peripherals you can evenly connect between the two. They don't take as much power that they need to be on their own rail like that.

Also I'm not sure the 500W is what killing your GPUs, as each of them still takes about 75W from the motherboard (aka rail V1), so they should have more than enough.

Best way is to test if its your PSU, is run furmark.
If it shuts down pretty quickly, its power issue. If it runs fine without problems for 30 minutes, its not power, its most likely something else.
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post #3 of 27
I ran highly OC'd 480s in SLI with a 9800GT for PhysX for a very long time and my HX1000 never broke a sweat.

You just need to make sure you're balancing your rails; one 580 needs to be on V1, the other on V2. Putting them on the same rail is honestly just asking for trouble.
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post #4 of 27
Quote:
Originally Posted by MNiceGuy View Post
Also, considering the sort of odd nature of the HX1000 and it's two fully independent 12V rails I might have things hooked up wrong. The hard wired PCIe leads run from V2 along with the peripherals while the core system runs from the V1. I have the second GTX plugged into the V2 rail using the modular connections but I'm not sure if that is ideal. Both GPU's are then running from the 500W 12V2 rail which may not be ideal.

I also know that if a GTX 4xx is not properly connected to power it will produce the same result; a video-less post with the system seemingly hanging with the GPU fans wound up.

Does this sound like a power supply issue or could there be something else preventing the system from booting properly? If this is a power supply issue should I move one of the GPU's over to the 12V1 rail to balance to load a little more effectively?
Definitely not a good idea!

See pic 1 below for the two rail distribution.

See pic 2 for hooking up a pair of high power graphics card to the same rail. This is NOT recommended by Corsair.

See pic 3 for putting the 2 cards apart, one to V1 and another to V2. Do this!!


post #5 of 27
Thread Starter 
I spent the night doing some experimenting. I also have an HX850 on-hand so I thought I'd put it to use.

EXPERIMENT 1:

-HX1000 with balanced rails
-580 SLI

Result: Boot Hang

EXPERIMENT 2:

-HX850
-580 SLI

Result: Boot Hang

EXPERIMENT 3:

-HX850
-Single 580

Result: Boot Hang

EXPERIMENT 4:

-HX850
-The other single 580

Result: Boot Hang

That narrows things down a bit. The HX1000 is off the hook for sure. I noticed that this phenomenon only occurs when restarting the system immediately following a gaming session. In other words GPU temps were somewhere between 75-80*C. If the cards were allowed to cool slightly to say the 50's or 60's then the system rebooted great.

I wanted to see if perhaps my NB was getting toasty so I let the cards heat up and then used Afterburner to manually wind the fan out. This I feel would cool the cards much more quickly than the passive NB would be able to keep up with. Once I hit 60* I rebooted and was successful

MY THEORY (SORT OF):

Do these cards have some sort of countermeasure against being booted up hot? Everything I can tinker with seems to revolve around high temperature (not overheat) being the controlling factor.
post #6 of 27
So let me understand.

You only get that problem when the cards are very hot?
As in no matter which card (out of the 580s you have) or PSU you connect, when the card is hot, it won't boot?
Have you tested this with both cards as singles (as in HX850+580 number 1 and than HX850+580 number 2)? Maybe just one card has a problem and the second one is fine?

Have you tested how long it takes for the card to cool down?
As in stress it using furmark/kombustor for 4-5 minutes, than stop the test and see in MSI AB how long it takes the cards to go back to idle temps.
It it takes way too long, its either the cards or some sort of cooling problem.

This sounds really strange. If you push the card for example 85c, and reboot, you shouldn't have the card at 85c when you restart. It should be much lower, unless the cooling in the case or the card are blocked.

Do you have the option to test the same thing on another computer?

I myself have tested my 580s in tri-sli on air, pushing them nicely into the 80+ degrees, than force a restart, and never had a problem or a hang.
So for me at least, its a bit weird that the cards act like that.
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post #7 of 27
(1) Say, after a long gaming session and the 2 cards are heated up to 80C (frankly, this is not an alarming temperature), your turn off the PC.

Your first post seems to indicate that you still can immediately bootup with no problem (even the temperature of the 2 cards has not dropped) IF you flip the switch of the PSU to OFF and then back to ON. Yes?

(2) When you bootup, do all the fans (especially the CPU and both cards) spin up to the max speed immediately, say for the first 10 seconds? Better to open the side panel and do visual confirmation.
Edited by windfire - 4/12/11 at 12:36am
post #8 of 27
Thread Starter 
1. Yes. I can flip the mains switch on the PSU I will get video signal on boot. Alternatively if I wait 60-90 seconds without flipping the mains I can get signal as well.

2. Best I can tell the case and CPU fans spin up immediately but the GPU fans are slightly delayed. During instances when I don't get video signal on boot the fans are stuck somewhere in the 60% range by my estimation.

Everything seems to revolve around temperature.

Simply put, regardless of the power supply or GPU configuration if I reboot the system with at least one of the cards in the 70-80 range I will get a full boot to Windows but without video signal.

If I allow the cards to cool to 60* or below I can reboot completely fine.

I have also updated the BIOS on my P6X58D-Premium and during these tests the northbridge heatsink is warm but not hot. My system is not overclocked.

It sounds like Defoler can boot his cards hot all day long. Any ideas? I am thinking about swapping them today.
Edited by MNiceGuy - 4/12/11 at 7:09am
post #9 of 27
Another question.

Has this been happening ever since you got the second 580 and new PSU?

Have you ever tried that with your old 580 and PSU?


Edit:

Also, thing.
If I understand right, if you run the card very hot, shut down everything, flip the PSU switch off, flip it on a sec later, and start the system, it runs normally?

If so, its not the cards. I think its the PSU, that its not able to deliver the full power requirment for the card to spin its fan to full speed to lower the temps as the system boot up.

Have you tried running the two cards with the HX850? It shouldn't be a problem power wise.
Edited by Defoler - 4/12/11 at 7:24am
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post #10 of 27
i have a weird 580 Sli problem too :S my wallet seems to be a lot lighter and emptier
     
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