2 x AIO watercooled 1080 Ti's, Seasonic PRIME Titanium 850W, PC shuts off under heavy load in GTA V

caw2007

caw2007

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So like the title implies, I have 2 GTX 1080 Ti FEs powered by a Seasonic PRIME Titanium 850W PS. I play a lot of GTA V at 4K on an X99 based system with no overclock. I have troubleshot the hell out of this thing and it's down to the power supply being the culprit. It gets quite warm to the touch. The system generally just clicks off, especially when I go to fly a plane. High SLI load seems to do the trick. I'm really shocked this PS can't seem to handle this setup. I still have some testing to do including swapping to my older Corsair HX850 that ran this same setup with overclocked 980 Ti's.

So my question is, am I being unrealistic in my expectations of what this PSU can handle? What are people who run similar setups running PS wise? I read a lot about people saying SLI anything requires at least 1kW but that seems insane and I never had a problem with my 980 Ti's.
 
you could hotwire your other psu and use it to power the second card to see if low wattage is the issue. those 1080s are just drawing more than you 980s did, the aios add to it too. ive seen several others around here with the same issue, new psu was the solution.
 
If you look at the HardOCP 1080 Ti GPU review, a single card draws about 330W in full load.
So if you have two cards running under close to 100% load, you are asking for 660W just from your GPU.

You're close to the top end of your PSU

I had a similar issue a while back running two Crossfired R9 290X cards in my system.
I had a Seasonic 850W PSU and the system would simply just click off under gaming load.
I added a second PSU in testing to run the second card and the issue was solved.

Replaced the PSU with a Corsair 1050 HX and never another issue.

Might want to get a Kill-A-Watt meter and look at the wall draw.
 
I may be a befuddled old dinosaur, but as I recall, PSU makers are allowed to advertise wattage (850W) as the total wattage it can handle across all the rails, so 850W can be a bit misleading when you're drawing 660W with your GPU load. It really doesn't matter if your 5v rail can handle 15a when your GPUs are drawing most of their power from the 12v rail(s) *I'll couch it with a "most" since I'm not actually sure if PCIe slots and power connectors ONLY pull 12v*. You might check if your PSU has multiple 12v rails (and if it does, keep the GPUs on separate ones).
 
capt_cope said:
I may be a befuddled old dinosaur, but as I recall, PSU makers are allowed to advertise wattage (850W) as the total wattage it can handle across all the rails, so 850W can be a bit misleading when you're drawing 660W with your GPU load. It really doesn't matter if your 5v rail can handle 15a when your GPUs are drawing most of their power from the 12v rail(s) *I'll couch it with a "most" since I'm not actually sure if PCIe slots and power connectors ONLY pull 12v*. You might check if your PSU has multiple 12v rails (and if it does, keep the GPUs on separate ones).
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That is quite outdated info, so I would agree that you are a befuddled old dinosaur.

Modern multirail power supplies (especially top tier ones) have power properly distributed across the rails such that unless you're stupidly daisy chaining adapters and splitters, you would never overload a single rail without overloading the PSU. Modern midrange and higher power supplies also utilize the DC-DC approach for greater efficiency, which also means that the full rated wattage is available on the 12 volt rail. The Seasonic Prime is a very modern top tier single rail power supply, so none of what you said is applicable.
 
Master_shake_ said:
an 850 watt platinum PSU isn't powerful enough for 2 cards jesus.
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Depends on what the two cards and the CPU are. The Prime 850 will easily handle your 4790k and two 980s, but two 1080 TI's and a 5930k can consume 300 more watts than your system. Also 80+ certification has absolutely nothing to do with how much power it can supply to the computer.
 
Nice power supply, but probably cutting it too close.
It's why I don't think I'll ever get rid of my modded BFG EX1000s.
Worth every penny of the $50 I paid for each way back in 2009/2010.
 
As a test, I ran GTA V with SLI turned off and bumped the power limit and temp limit on my active 1080 Ti to max in Afterburner. Played for about 40 minutes hitting places and scenarios that would've cause the PC to shut off before and had no issues whatsoever.

I went ahead and ordered a Seasonic PRIME gold 1000W yesterday to hopefully alleviate my issues.

To address Master_shake_'s insightful comment, I ran two overclocked 980 Ti's on this same setup including AIO watercooling, but with a three year old Corsair HX850 instead and it ran fine for over a year.


I'll be putting up my 850W PRIME Titanium soon. Thanks to those with helpful insights! Thread can be closed.
 
How did you cable it? 1 full cable per pci-e plug aka 2 per GPU right? If you tried to double up that would be a classic mistake.

Some of you failed to notice this too:

X99 based system with no overclock
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IMO Dual Tis and a stock CPU should have no problems with a high quality 850W that will always give 850W of 12V even under stress.
 
Aluminum said:
How did you cable it? 1 full cable per pci-e plug aka 2 per GPU right? If you tried to double up that would be a classic mistake.

Some of you failed to notice this too:



IMO Dual Tis and a stock CPU should have no problems with a high quality 850W that will always give 850W of 12V even under stress.
Click to expand...

I tried it cabled both ways, same issues. 1000W works with no issues.
 
150 watt CPU, 250-300 watt GPUs that can spike to 350 watts, 50 watts for the system, possibly a more aggressive OPP protection (some power supplies are very lenient allowing up to 150 watts over what they are rated for), and you end up with an overloaded PSU. Then again, the OPP or OCP may not have been set properly for the OP's PSU. Who knows without additional samples.
 
Were you ever able to test draw at the wall with a Kill-a-Watt or something similar? Just curious, because you should have been within the limits of an 850W in theory. Just wondering if there may have been a problem with the old PSU.
 
Bandalo said:
Were you ever able to test draw at the wall with a Kill-a-Watt or something similar? Just curious, because you should have been within the limits of an 850W in theory. Just wondering if there may have been a problem with the old PSU.
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I never did get a kill-a-watt or test the power draw at the wall. I honestly never had any issues with the 850 W Titanium except in specific instances where SLI load was particularly high.
 
caw2007 said:
I never did get a kill-a-watt or test the power draw at the wall. I honestly never had any issues with the 850 W Titanium except in specific instances where SLI load was particularly high.
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That's just why I was curious. I noticed you've already replaced the PSU, so it's a moot point now regardless.

It'd be interesting to see how much you're actually pulling with that setup. I had a heavily overclocked 5280 and a pair of 980Tis, and I didn't pull too close to the limit of my 850W supply at the time.
 
Bandalo said:
That's just why I was curious. I noticed you've already replaced the PSU, so it's a moot point now regardless.

It'd be interesting to see how much you're actually pulling with that setup. I had a heavily overclocked 5280 and a pair of 980Tis, and I didn't pull too close to the limit of my 850W supply at the time.
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I did too! I ran that setup on a Corsair HX850 and very briefly on the Seasonic Titanium 850 W with no problems.
 
caw2007 said:
I did too! I ran that setup on a Corsair HX850 and very briefly on the Seasonic Titanium 850 W with no problems.
Click to expand...

That's what makes me think that your old 850W PSU might have a problem, and not just be underpowered for your rig. If you were tossing it, it wouldn't matter...but if you're going to keep it as a backup or resell it, it might be worthwhile to know if it's actually defective or not.
 
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