System specs
Gigabyte GA-z170x-Gaming 7, bios fg7
i7-6700K liquid cooled, 4.6g, 28-58c
32 gigs G.Skill DDR4 Ripjaw, 2135
EVGA SuperNova 1050 G+
2 ea GTX 980 Kingpin Classifieds SLI (not sli but bridged)
1 tb SSD
6 tb 7200
4 case fans
Windows 10 Pro, latest build.
 
When I first SLI these cards they worked great, Fire Strike/Fire Strike Extreme was excellent, gaming was excellent.
After about a week the voltages changed on the cards, they were both different, so were the clocks, computer driver started crashing/recovering, I couldn't get them to even out.
Then Huge pixels started showing up while gaming and bench marking, along with the Pixels the characters , buildings and everything else started getting these long streams like arms would have 8' attachments stretching off of them, fps dropped to almost nothing including 1fps at times colors were horrible.
I replaced the power supply with another like one, still the same, reloaded windows 10 Pro making sure the bios was UEFI and not legacy.
same problem.
Put two GTX 970 SSC SLI and they worked fine. removed them put the two 980 Kingpins back in and the same problems.
 
Replaced memory, still no luck.
 
Removed the SLI and the cards worked fine individually, stressed tested them 8 hours individually/memory/CPU with no problems. Bench marked individually with no problems.
 
Currently I have them together but not SLI, bridge is connected, both cards voltage and clocks  the same, each card running a different monitor with no problems, Fire Strike/Fire Strike Extreme and games run excellent. Games run excellent with no fps drop or loss even Fallout 4 which has a huge fps problems, other games up to and over 200 fps.
 
All three power plugs plugged in and working on each card, all equipment working, cards SLI and work beautiful at first for about a week, then one day I started computer and all problems.
 
tried every mobo bios setting I could think of, with no luck.
Card temps are always cool, no over heating.
Does anyone know what might be wrong or what I might be doing wrong?
Everything is updated, all drivers including moving back and forth between Geforce card drivers trying different ones, current driver is latest.

You sat card temps are always cool.. how cool? The 980 KPE is very sensitive to temps around 60. It will artifact and give errors at low temps. You can want to get them even lower, near 40's if possible. Mid 50'50's at the highest.

Ok, so I tried the suggestions, heres what happened.
Tried three different bridges, tried them on one finger, the other finger then both fingers together, changed settings on both cards from: Normal to OC to LN2, tried Kboost/Over boost/Over voltage in different combinations, overclocked then under clocked then reset - GPU clock offset and Mem clock offset,  with both cards and individually, over clocked and returned CPU.
Voltages on cards-1075 mv, when stress testing them they work fine in SLI until the voltage goes up to 1200 mv then they get angry and dont work.
Individually both cards stress test and pass, SLI they fail and dont render using OCscanner X.
Verified system by putting two GTX 970 SSC's in SLI, they work great, went back to Kingpins, in SLI they fail, but individually they work excellent, temps for both when stressing- 44 to 55c, CPU 48c.
When cards are set to Normal on the switches, windows stops them saying they reported an error, when switches on both cards are in-OC or LN2 they operate fine.
I did notice that both cards have a different bios, I dont know if that matters
Card 1 - 84 04 31 01 81
Card 2 - 84 04 31 01 80
 
Right now both cards are installed, bridge is in place each has its own monitor connected, but they are not in SLI, they bench fine, they run fine, they game fine.
No viruses, no malware, clean install on SSD.
All hardware checks out, even both cards individually, just not in SLI.
I really cant figure this out because two GTX 970 SSC SLI run just fine in this machine.
They are working fine on their own, guess I'll just buy more monitors to fully use both installed cards.
 
I have tried:
OCScanner X
3D Mark
ROG RealBench
Prime 95
NvidiaInspector
Unigen
 
Full Specs everything connected and running:
 
Intel I7 Core 6700K Skylake CPU 4400
GIGABYTE GA-Z170X-Gaming7 MOBO F7g
64 Gig DDR 4, G.Skill RipJaws V 2133 
2x EVGA GTX 980 Kingpin Classified 
Creative Sound Blaster Fata1ity THX 3D PRO Sound Card 
1 Terabyte SSD 
6 Terabytes Hybrid 
1 Terabyte External SSD 
BD Internal 
2 ea Nakamichi 300 Watt 3D Suround Sound Speakers Optical 
2 ea Sharp Aquos 3D 65 inch Quattron UHD 
Sony Bravia LCD HDTV 32 inch 
EVGA 1050 G 80+ PSU 
Zalman Raserator 3 Maxx Dual Liquid Cooling 
Razer Naga Epic Chroma 
Razer Oroboros 
Razer BlackWidow Chroma 
Razer Firefly Mouse Mat 
Razer Kraken Pro 7.1 Chroma 
ANTEC 1900 Case 
Windows 10 Pro 
 
Anymore help would be appreciated, I'm out of ideas.....

What are your PSU voltages like, idle and under load? Will the cards work fine in SLI if you're on the OC BIOS?
 
There's an issue with OCScanner running in SLI on Win10 with the recent drivers, and it's producing corrupted rendering. It's known, and being fixed. Do you have any issues when running 3DMark or Valley on the OC BIOS in SLI?

Sli fails in everything, and in all progs including gaming, but the cards work fine individually, clocked or not, weird colors, weird patterns then driver crashes, black screens, white screens no bluescreens.

 

Cliford
Sli fails in everything, and in all progs including gaming, but the cards work fine individually, clocked or not, weird colors, weird patterns then driver crashes, black screens, white screens no bluescreens.

More than likely, you're doing something terribly wrong, and that's probably why SLI is not working for you. I have zero problems with SLI, with stable clocks, stable drivers, despite Geforce Experience, which I got rid of.

Yes, ram is approved manually set to specs, psu is stable, used ddu multiple times for multiple drivers, tested each card individually-passed, tried 3 different sli bridges, various voltage settings, under clocking, a fruend is bringing his two cards over tonight to test, same cards as mine.

Cool GTX

stalinx20
 

Cliford
Sli fails in everything, and in all progs including gaming, but the cards work fine individually, clocked or not, weird colors, weird patterns then driver crashes, black screens, white screens no bluescreens.

More than likely, you're doing something terribly wrong, and that's probably why SLI is not working for you. I have zero problems with SLI, with stable clocks, stable drivers, despite Geforce Experience, which I got rid of.

I believe that was a response to Sajin's post #6 question --- not condemning SLI in general

Thanks. I only read the last post (I think I posted just after you, literally), which was a knock on SLI, and then reading the subject line, kind of put my own "2 and 2" together. Clearly, was a bad idea.

Cliford
My son is brilliant, he suggested I go back to Windows 7 Pro.
I reloaded Windows 7 Pro, all software and now everything works!!!!
I had to install NvidiaInspector to limit fps, some games dont like to go that fast.
 
Thanks to everyone that gave me suggestions, but in the end I just had to down grade the OS to fix everything.
Never could get Windows 10 Pro to work right.
I'll just stay here for now...

So just for the hell of it I reloaded windows 10 Pro, sli still didnt work, bench marking worked fine, all games on the other hand had huge multi collored pixels 1/2" spuare in size, looked like a disco ball, everything had long spikes, then driver crashed, tried every nvidia driver I could find online, non helped, reloaded windows 7 Pro and sli works again, bench marks and games, I have two $750.00 cards that I cant use with windows 10 Pro, so I guess Ill stick with windows 7 Pro, cause I just cant figure it out. With windows 10 my top card lights will turn off and on from time to time then the problems start, with windows 7 that does not happen, the system is stable, my psu is fine also. Just weird.

The lights flashing sound like the firmware issue that T|n addressed over on the KPcooling forums.

I know that having the air cooler on the card caused my cards to artifact really bad, and once they were watercooled, the issue never resurfaced. You need to keep the temperatures really low, below 60c when possible, for the KPE cards to work without many issues.

That was why I didn't go for the KPE card when I sold my 980's.