SLI 1080TI restarting comp

Brandon Hadley · 7 Jun 2017 at 10:45

Hi everyone! I have just built a beautiful new computer and it has been running perfectly but I have got greedy and decided to SLI it. I have bought the official Nvidia SLI bridge to make sure I get the best out of it. The issue is as soo as I turn SLI on and start to run a game, after about 15 seconds the computer restarts. Sometimes I even get the blue screen saying 'SYSTEM_THREAD_EXCEPTION_NOT_HANDLED'. My system is as below;

Asus Z270f motherboard
Intel I7 7700k running at about 4.5Ghz
32GB of Gskill Trident Z Ram
500GB Samsung Evo SSD
1TB Samsung Evo SSD
2 x Asus ROG 1080TI Graphics cards
850W Corsair power supply.

Any ideas please help!

Thanks, Brandon

ArmitageShanks · 7 Jun 2017 at 12:07

Take out (or disable) the original GPU and try running with just the newer one in place (non-SLI). It could be a duff card.

Also check you have the latest drivers (although with nVidia, that's no guarantee of stability...)

It could also be a power problem - make sure you have the additional power connectors firmly attached.

Dirk Diggler · 7 Jun 2017 at 12:28

My money's on the power supply.

five8five · 7 Jun 2017 at 12:38

Make sure everything is at stock speeds then test it.

Some MBs require an extra power cable to be connected when using CF or SLI but I couldn't see anything in the manual. It does recommend a 1000W+ PSU though when using CF or SLi which does seem a little bit of overkill.

tyler_jrb · 7 Jun 2017 at 12:40

+1 1080Ti SLI can easily use 600w+ alone so cutting it fine for the rest of the system especially when you start overclocking.

ArmitageShanks · 7 Jun 2017 at 13:14

I'd be surprised if his system was pulling more than 700W peak from the wall. An 850W supply should be sufficient - if it's working correctly.

LeMson · 7 Jun 2017 at 13:47

tyler_jrb said:
+1 1080Ti SLI can easily use 600w+ alone so cutting it fine for the rest of the system especially when you start overclocking.

Evidence?

you have an i PSU, show us your power draw

five8five · 7 Jun 2017 at 14:04

LeMson said:
Evidence?

you have an i PSU, show us your power draw

If you're using his sig for that it may be difficult as it only shows one Ti.

mingey · 7 Jun 2017 at 14:24

ArmitageShanks said:
Take out (or disable) the original GPU and try running with just the newer one in place (non-SLI). It could be a duff card.

Also check you have the latest drivers (although with nVidia, that's no guarantee of stability...)

It could also be a power problem - make sure you have the additional power connectors firmly attached.

Do exactly this and test the card on its own first, but for what its worth, an overclocked system with 2x1080ti SLI and a 7700K OC, is cutting it for the power supply ( getting any coil whine ? ), especially some of corsairs lower models, PSU can and will degrade eventually, more than likely the PSU if your new card check out solo. ( if you can borrow one to test, all the better ).

tyler_jrb · 7 Jun 2017 at 14:36

LeMson said:
Evidence?

you have an i PSU, show us your power draw

Sure, let me find my cable.

But for knowledge alone my 980Ti SLI used to regularly draw 900w. Most it ever drew with a custom bios on both cards was 1100w from the wall and that was because the PSU maxed out. The cards had to down clock.

As you wish... card is maxed with around 20% usage across all cores on the CPU.

LeMson · 7 Jun 2017 at 15:21

Yeah googling supports a 1080ti power draw load of around 400, so 2 = 800, might need a beefyer PSU

https://www.bit-tech.net/hardware/graphics/2017/04/13/aorus-geforce-gtx-1080-ti-review/10

edit: that's total system though, so now I'm not sure

http://www.guru3d.com/articles-pages/geforce-gtx-1080-2-way-sli-review,4.html

suggests 400 for both cards in sli?

google also says 850 psu should be good for 1080ti sli

rtho782 · 7 Jun 2017 at 15:35

This is my single 1080ti while mining cryptocurrency....

I'll have 1080ti SLI tomorrow but I would imagine that SLI, with an overclocked CPU, and CPU load (currently only my GPU is loaded) would be really tight on an 850W PSU.

beany_bot · 7 Jun 2017 at 15:35

String said:
My money's on the power supply.

My 390x used to do this occasionally. Never got to the bottom of it. Did all my PSU calculations and was apparently "fine" so ruled it out.

After getting my 480 it hasn't happened since. So was likely a power issue.

Brandon Hadley · 7 Jun 2017 at 18:09

Hey everyone! Thanks for the input so far! I have swapped the cards. Used the secondary card as a primary (by itself) and it works fine. I have changed the SLI Bridge and turned it back on and I am still getting the restarting and green videos aswell as black bars. Do you really think the PSU is the problem? It is a brand new 850 but I can get it changed if necessary.

Thanks so far!

Dirk Diggler · 7 Jun 2017 at 18:37

@Brandon Hadley is the PSU within its 14 day return period? If so, exchange for a 1200w model.

Be careful with the amount of testing you are doing as you may damage your system if the PSU is struggling

five8five · 7 Jun 2017 at 19:15

five8five said:
.....I couldn't see anything in the manual. It does recommend a 1000W+ PSU though when using CF or SLi

Check your motherboard manual.

Kaapstad · 7 Jun 2017 at 20:14

Brandon Hadley said:
Hey everyone! Thanks for the input so far! I have swapped the cards. Used the secondary card as a primary (by itself) and it works fine. I have changed the SLI Bridge and turned it back on and I am still getting the restarting and green videos aswell as black bars. Do you really think the PSU is the problem? It is a brand new 850 but I can get it changed if necessary.

Thanks so far!

Run your CPU at stock and see what happens.

Sasahara · 7 Jun 2017 at 20:30

Kaapstad said:
Run your CPU at stock and see what happens.

Was just gonna say the same, my ti is using around 280 W from the wall, but it could well peak a little higher than that.

What specific PSU is it, there are a lot of 850 W Corsair models?

Dirk Diggler · 7 Jun 2017 at 20:40

I don't think it's wise to keep testing the system. I fried a 5930k a couple of weeks ago because of a faulty PSU.

Brandon Hadley · 8 Jun 2017 at 07:07

Hi Everyone! Everything I read on Nvidia about a second graphics card is that when you plug the second in the drivers you originally installed would be sufficient. After changing so many things I wanted to delete the current drivers and reinstall. IT WORKED! Do you guys think I should still upgrade the PSU? Everywhere I read says the 850 should be sufficient.