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Think some causes of error... After 61 hours of my renderer in v2.25, I didn't want reboot PC, I had rendered v3.00... and got error 2 times (1st ~10 minutes and 2nd ~2 hours). Stock VRAM speed is issue. I downclocked VRAM from 7000 MHz as stock to 6840 MHz.

2 days after reboot PC, I'm rendering 40 hours (81500 of 151708 S/px) using v3.00 beta4 - still no problems at 6840MHz VRAM... But at resolution screen of 3840x2400. Full load - now 64 ºC at ~87% fan speed.
I'll end render at 01am UTC on monday.

I'll leave my GPU to RMA in end of this month, if I'll get still white flicker bars in GT2 - 3DMark11 at all stock speeds after display driver uninstaller (DDU)

I got GPU failed at 3rd time with the same error.

nuno1980 wrote:If I'll get still white flicker bars in GT2 - 3DMark11 at all stock speeds after display driver uninstaller (DDU)

After GPU failed in OR, I rebooted PC with GTX 780 Ti Classy as primary display and I benched 3DM11... And I got no any flicker bars running W10 x64 with same GFX driver HQ.

I've received new EVGA GTX 980 Ti SC+ ACX 2.0+ on monday (june 20th) after GTX 780 Ti Classy RMAed. And... I got no any render failed v2.25, v3.00 demo and v3.01.1b*.

I think VRAM issue for GTX 780 Ti classy because Hynix is bad brand.

* - I've upgraded to v3.xx.

Hi Nuno,
great that you have solved
By the way, good to know, even if I never heard about that brand
ciao beppe