I recently just got a used x79 Dark Mobo which is what i've been looking for a bit and I have a 4960x cpu.  That's not the issue here at all.  I have two 780 ti's that I had in a x79 classified and they ran fine with SLI and I just wanted a more stable board than the Classy.  Since I changed boards and the x16 slots are in different spots now I can't use my fancy SLI bridge anymore as they are closer together.  Digging around my extra computer parts I found 2 ribbon bridges one is EVGA and the other is ASUS.  I've tried both of them one after the other and it seems like my system will run fine but when it's been on for about 10-20 minutes everything starts to lag such as chrome will take a bit to open and the close a tab instead of being instant.
As soon as I disable SLI the problem is gone.  I have everything hooked up properly and I even added the extra 6 pin connector to the board for extra GPU power for SLI.  Could it be the bridges?  I've never used the ribbon ones before as I've always used the 3 or 4 way ones.  I have the newest bios.  I am stumped at what it could be.  I have windows 10 with the latest updates, latest drivers, everything I can think of is up to date.

It does have Bluetooth.  The only thing that looked a bit off was the CPU pins I think.  One might have not been straight but I don't have any other issues with it.  I have them both in the x16 slots as well.  I just can't wrap my head around it and I've looked around to see if anyone else has had this issue and I haven't just with SLI in general with windows 10 but other boards.

I don't have the bluetooth installed I disabled it in the bios if you were asking about the drivers for that.
I have Windows 10 Pro Version 1703.  I'll have to check but I thought I set them all to Gen3.  Maybe left it on auto if that was an option as well.  I did that one the classy mobo and everything was fine.

Driver is 385.69.  I just did a fresh install of windows for this newer build.

PM me your Address and I will send you a SLI Bride V2 of the EVGA Bridges as I no longer need mine.

Because I removed my GTX 980 Cards and put in some GTX 1080 Ti Cards I do not use the SLI Bridge anymore and if someone can use it then great, not asking for any money for it.

Only that it completes and has a valid score.
If you screen is all messed up when running then you may a bad SLI Fork on one of the cards.
Nice that they have Two Forks, not so nice on a Pascal Card as you need both forks for HB Bridge.
Remember that not all games support SLI and some will run Better when SLI is Disabled.

brevaun
It went through.  First time I ran it, it said canceled by user but I didn't even do anything.  Second time around it went though it.  Not stuttering or anything.  I had no problem with CS GO before I changed boards and cpus.  It just concerned me as CS GO ran fine with SLI enabled and then after that short time would be unplayable then.  So far nothing out of the ordinary going on.

You cannot use the Mouse or KB once the test starts, it will kill the test.

List all your hardware
Make and Model and on the PSU Age.

I take it you are on Bios 2.13
Have you updated Chipset Software? (https://forums.evga.com/FindPost/2685654)
Others will post that their are newer Chipset Drivers that are not from Intel's Website, I only use the ones from Intel.
I have Two "EVGA SuperNOVA NEX1500 Classified Power Supply" Not using them anymore but did like them.
On to 1300 G2 and 1200 P2 & 1000 T2 now.

No, Both my X79 Dark MB are running 2.13 and I have seen no issues.
My Dark with BT also is using the i7-4960x View System

Well I switched the 780 ti's around and now I don't seem to have an issue.  What would cause one card to drop like that?  Could it be a possible dying card even though it's the newer one?

Yes.  I stated that in the very first post.
" I have everything hooked up properly and I even added the extra 6 pin connector to the board for extra GPU power for SLI."
So far It has not happened after switching the cards making the other the main card.  That only makes me think something could possibly be wrong with it now.

Yes i did. They both did the same. Until i stitched cards. So far no issues.

Even though I had good ventilation the heat and extra electricity costs were the reason I went to a single GPU solution. GTX 1080ti is the way to go.