Not to sure if I can help or not but I have a couple questions
1. is your OS a UEFI install, new GPU's have a UEFI bios
2. have you installed the force enable gen 3 https://forums.geforce.com/default/topic/521828/geforce-drivers/geforce-600-series-gen3-support-on-x...
3. have you tried without the Sound Blaster card, maybe a conflict with software
4. is your memory kit one kit or 2 kits combined for 64GB, try upping memory voltage a tad
Please let us know if you get this resolved
I have the same sort of thing here. I've tested mobo, cables, GPU, screen, drivers, different PCIe slots, different GPU outputs .. problem persists. Waiting for more expert advice.
Thank you for posting your solution timbo2410.
I always do a custom (advanced) install of the nvidia driver, I uncheck everything except the graphics driver and physx driver then check the only box that says perform a clean installation.
I highly doubt it's your psu, johnnyguru gave it a 10 out of 10.
Maybe try running your system with 1 or 2 sticks of ram.
Since all was well before I wonder if reinstalling windows would solve it, have you installed any programs or new hardware when you started having problems?