When I activate SLI, my computer gets extremely laggy and goes down to

EvanIsAwesome420

Commendable
May 12, 2016
8
0
1,510
CPU: i7 6700k GPU: 980ti SLI RAM: 16GB DDR4 @ 2400MHz Motherboard: MSI ATX Z170A GAMING M7 SSD: Samsung 850 EVO 500GB HDD: Western Digital Blue 1TB

So, I built my computer around black friday / cyber monday of last year. Now, of course, being the idiot I am, I forgot to enable SLI and because it was my first time building a computer, I didn't even know I had to enable it besides the actual hardware part. Well, a few months go by, and everything is fine, however a few days ago and I look into it. It turns out my monitors were plugged into separate GPU's, so I fixed that and plugged them both into one. I have started experiencing problems ever since I enabled it(just about, not sure if enabling SLI caused it which was about 5 days ago).

Now, onto the problem. My computer starts out just fine when I turn it on. The majority of times that it the lag begins is after I alt-tab out of a game. For example, if I alt-tab out of CS:GO to Google Chrome on my other monitor, extreme lag sometimes ensues. It's not consistent at all. A few days prior, I disabled NVIDIA Geforce Experience from running on startup. For some reason, when I enabled it again, the lag stopped when I alt-tabbed out of CS:GO, however it still happened with other programs. It also happens if I leave my computer on / am AFK for a few minutes. It also happens when I close / open a youtube video as well. Of course, it doesn't always happen when I do these things. Sometimes, I can alt-tab and no problems present themselves. When my computer does lag out, I restart it and it works fine again until the lag starts again. I didn't download any programs besides a few games off of Steam, updating a few things programs and drivers. I was planning on restoring to a previous backup, but the backup that I would've restored to was very recently replaced by a new one where after the problem started happening. Currently, I am typing this while lagging. I have the Resource Monitor open right now and CPU usage has stayed between 2-10% and the memory has been consistently at around 2.8GB-3GB. All I have open is Steam, Google Chrome, Skype, and the Task Manager. I have run a few scans for viruses with Malware Bytes, however I shouldn't have a virus because I haven't download anything from any suspicious sources, only big name sites like steam and driver updates. I don't remember all the updates I have done in the past few days, but I believe I've updated Skype, Steam, Geforce Experience, Java, and GPU Drivers(tried downloading via NVIDIA's website and through Geforce Experience). Additionally, I have been getting an error sometimes when I shut down my PC for a while now(happened even before I enabled SLI) which was something along the lines of a system error (0xc0000142). I did some research and found the fix to it was to run command prompt as administrator and type sfc /scannow. It may have fixed the problem as I haven't seen the error as of yet, however time will tell because I didn't get the error too often.

Before I end this post, I'd like to describe the lag. When ever I drag a window around(such as Google Chrome), the window stutters and lags considerably. The computer slows down completely. Whenever I try and play games with the lag, its almost as if my computer costed as much as a loaf of bread with the FPS I'm getting(looks like 10). Somthing odd that happens is that even with the extreme lag drops(which continue in-game), the steam FPS overlay continues to display FPS numbers like no lag is happening such as 300+ FPS even though it looks like a slideshow.

I feel like I've done a bunch of trouble shooting while trying to figure out how I can consistently recreate the lag, but there are multiple ways and it doesn't happen 100% of the time. I really don't know what to do, and whether or not I should disable SLI and go back to my old setup(each monitor to a separate GPU). The only problem with that I'd feel like I'm wasting my money by not using the GPU's in SLI. Please, can someone help me!?

P.S. Once I revert back disable SLI, the lag stops happening. Please help!
 
Solution
Well, I'd probably recommend a power supply test anyway. While that power supply SHOULD be able to handle your system with ease, if it's failing to successfully power the two cards... hey. Power supplies fail.

Also check your motherboard manual. Check to make sure there's nothing interfering with the PCI-E lanes. The processor only supports 16 PCI-E lanes.

-Wolf sends

EvanIsAwesome420

Commendable
May 12, 2016
8
0
1,510


https://www.amazon.com/gp/product/B00JN1TT2M/ref=detailpage?ie=UTF8&psc=1[strike][/strike]

 

Wolfshadw

Titan
Moderator
Well, I'd probably recommend a power supply test anyway. While that power supply SHOULD be able to handle your system with ease, if it's failing to successfully power the two cards... hey. Power supplies fail.

Also check your motherboard manual. Check to make sure there's nothing interfering with the PCI-E lanes. The processor only supports 16 PCI-E lanes.

-Wolf sends
 
Solution