Enabling SLI restarts PC immediately

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l33tforza

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Apr 3, 2015
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When I try to enable SLI i get the apply changes, screen flickers a moment then the PC Restarts to windows and SLI is still disabled. I've tried rolling back to 368.22 and i have also switched out the cards. I cant seem to figure this out. I am thinking its the PSU but i dont know how to troubleshoot that. Any help would be appreciated. Thanks!

Specs

Win 10 64bit
Intel i7 5820k
Asus x99-A
x2 GTX 980 Ti
16gb Ram DDR4
Corsair H90
EVGA Supernova 850 PSU
 
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Nope no change at all, still throws me to a reboot immediately after hitting apply and the Applying Changes windows pops up.
Thank you none the less!
 
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Below is what I found with a google search. Forum contributor had some interesting insight. Before you go that route, I suggest that you check Windows event viewer (applications and system) and check any exception thrown at the times right before, during and after the reboots. It should shed some light on what's causing the reboot.

google query: nvidia sli reboot
google result: SLI makes computer restart | TechPowerUp Forums
http://www.techpowerup.com/forums/threads/sli-makes-computer-restart.132472/

Problem (from linked forum):
I installed my 2 cards ... I turned on SLI in nvidia control panel and it started making the screen flicker on and off and then restarts the computer ... then it does the same thing as soon as i get to the desktop ...

Answer (from linked forum):
Try this experiment.

Uninstall your network drivers. Restart and go into the BIOS. Disable your onboard network adapter. Exit and let windows load. If you can now magically enable SLi under windows with no problems there is a conflict between the nVidia drivers and your network drivers.

Do not use the latest network drivers from windows update. Try different drivers from Asus or whoever makes your mobo. I have to use older drivers from EVGA for my LE mobo, the windows updated drivers for my network adapter cause the same problems you are having with SLi. My primary comp is Intel/nVidia. (470 SLi)

Another way you could try it. Uninstall the network drivers and don't restart. Uninstall your nVidia drivers then restart. Enter your BIOS and select load defaults, exit and save. Let windows boot. Install your network drivers, restart. Install nVidia drivers, restart. Try to enable SLi after windows loads then. If SLi enables fine, reboot and put your BIOS back to your desired settings.

Also some people have problems with HD audio drivers nVidia installs. You may want to not install those particular drivers and disable HD audio devices related to your vid cards if you get no better results from trying different network drivers. When you try different drivers uninstall the nVidia drivers then your network drivers, then reinstall the network drivers followed by the nVidia drivers.

Make sure windows is set to download updates but let you choose when and if to install them.

These threads @ EVGA show people with similar issues and fixes.

http://www.evga.com/forums/tm.aspx?m=581076
http://www.evga.com/forums/tm.aspx?m=531113

Good luck.
 
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Still nothing has changed, but thank you.. Could it possibly be the PSU?
 
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Thank you, I will check all of this out. I'll be back with an update!
 
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I checked the Event Viewer and found Critical's at the times of reboots after trying to enable SLI

Event ID 41
Task Category (63)
Kernel-Power

The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.


..Perhaps its not getting enough power when enabling SLI?
 
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I also tried what was suggested with the network adapters. None of this made any difference, im still experiencing the same issue. Thank you all for your advice and concern. Any other suggestions?
 
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Who is the vendor of the cards? EVGA? MSI?

Your power supply is more than sufficient to power both cards, and it's tier 1. I suppose it's possible that it's defective. Besides power, heat is also a possible cause, except it would happen instantaneously the moment you enabled SLI. It would happen from excess heat during game play. If the CPU was overheating it would thermal throttle (slow down to prevent damage from heat) and then it would eventually reboot the system. Overheating the south bridge would also reboot the system, but again, it wouldn't generate that much heat from just enabling SLI.

Whoever is the vendor of the cards, open a ticket with their tech support ASAP. Also, what did you recently change in your system. I assume that you just added the second 980 Ti, but anything else? Regardless, open the ticket with the vendor now, to get the ball rolling.

Addendum: Do you have an extra power supply that you could try? I assume you don't, but thought I would ask. Do you have a friend that you could borrow a power supply from for one day?
 
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The 2 980 Ti's are different, one is EVGA which is what i use for my main and the other is straight from nvidia, i bought them both last year when they were released. Everything was working fine up until a driver update, and to be honest, i did not realized SLI was disabled until here recently like a week ago...i dont normally use SLI for gaming unless im feel like i need to. I use them for rendering in C4D using octane render, but since school has been out i havent been messing too much with any artwork. So it could have happened a month ago or just since the last few driver updates. I have not changed anything regarding settings or anything for that matter with the OS or system in general. I did install the AI suite 3 however. I did a fresh install at the beginning of the year for school and did not install the AI Suite because i didnt feel the need for it. I got a little curious with my processing power and decided to install it, like 2 months ago. Maybe this has something to do with it? Does that software automatically overclock the CPU? also, i have messed with the fan settings in the AI suite which would pull more power, but i dont think that would cause any problems. I dont have a spare PSU or know anyone around here that does. I will open the ticket at EVGA, Thank you for the direction and help, very much appreciated.
 
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You should just call EVGA tech support right now: (888) 880-3842

They are 24 hours and support is located in the US, even after hours. These guys are great and I deal with them all the time. The hold is normally five minutes or less.

CPU does not overclock by itself. But the BIOS on Asus boards does have an easy overclock feature that you can enable; obviously I would wait until after you resolve SLI issue.

Octane Render: I have the demo of that software! It was actually one of the main reason that I was so excited about having two cards; that and folding @ home. Check out the video below. It's what initially informed me about Octane Render. By the way, do you have any Cinema 4D or Octane Render produced work that you can show me? I obviously don't know much about content creation, but I want to learn. Perhaps I could start with recording game play and learn how to make it look super sharp and high quality?

DeviantRahll: Octane Render with 2 GTX 980ti's in Modo
https://www.youtube.com/watch?v=1aIl4VMyzxo
 
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Thank you again. I have been in contact with EVGA Tech Support. We still havent resolved the issue. I am more than likely just going to do a fresh install and see what happens but im not feeling like that is going to fix anything.

As far as Octane and C4D, go to instagram and follow or look at "LockedandLoaded" that is my professor and he does absolutely amazing work with Octane and C4D, i believe he runs x4 980 Ti's to render. He has tutorials as well.

Im not sure what you referring to as far as recording gameply and making it look super high quality. You will need to record at atleast 1080p unless you can have the ability to record at 4k or 2k. Whatever your source footage is, will be the quality it ends up, you can spice things up, but in the end, the quality is just that unless you create something from scratch in AE or C4D etc and render out Apple Pro Res or something of broadcast quality.
 
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