Good Evening everyone,
 
my Evga GTX780 SC ACX recently started kind of glitch/flash on transition from high to low load. It runs perfectly fine under full load, such as benchmark, no issues or artifacts whatsoever. It's only when the load decreases (e.g. one pauses youtube video), or rendering in slicer is done, clocks goes down and I get diagonal green/blue line in single frame. I have confirmed this in OCCT benchmark - steady and variable ok. When I set to switch 1% 20% 2000ms I start getting errors detected.
Please see a short video demonstration here:
- vimeo(dot)com/1018422467
- vimeo(dot)com/1018422768
 
 
Is there anything I could do? Could you help me in any way?
 
I would be more than happy to buy another Evga card for my machine. Recently I tried everything: replacing thermal pads, repasting, dismantling up to the latest screw and cleaning every speckle of dust. Changing the psu, trying the card in another pc, tried under linux, older builds of drivers and windows.. I have never mined, or misused the card in another way.
I even tried setting fixed voltage in Precision X / Afterburner. Didn't help unfortunatelly. It really seems, that this issue occurs when load decreases, like if there was a "spike of power" causing the momentary flash across the screen.
 
Only thing, which seem to help is to set Power Management Mode: Prefer Maximum Performance in nvidia control panel. Then the mem/core frequencies are set and the issue doesn't appear anymore.
 
I know, the gpu is loong over the waranty. I simply refuse to acknowledge that I won't have product from brand, I've been proud of in my rig anymore. Is there anything you could help or advise me?
 
Very recently I came across idea of playing up with bios, but gave up on the idea. What I did instead, I checked Techpowerup website where they host different versions of bios, based on people's upload. First of all I have to say, I have never mined or tweaked bios on my card.
My card came with a bios 80.80.31.00.82. Now bios isn't readily available on evga website, but there was a submission from someone uploading v 80.80.45.00.80. I gave it a shot and tried, since board id was same, frequencies same.
 
It seem to have improved the issue a bit. I get no glitches/flashes, but still get error in occt switch benchmark. What could be the reason of this behavior. Is it official bios by Evga, what are the changes please.
 
Is there anything you could do for me? Do you have any additional advices? Do you have any additional, could you share perhaps or custom bios to fix my issue? Could you share latest bios?
 
Thank you for reading up to there.