1 card good, 2 cards bad?
Posted: Sun Jul 23, 2023 2:23 pm
Finally found some time to investigate...
I'd been using a pair of 2080ti's without a hitch for years. Maximum parallel samples and never ran out of Vram.
Upgraded to latest version of Octane and installed latest Nvidia Studio driver.
Since then, very unstable and flakey regarding Vram. Same old models/textures/ resolutions etc so maybe it's the version of Octane or the new driver?
Tried just one 2080ti in the rig, rather than 2 and it worked perfectly in various PCI slots and with different connectors from the PSU.
Replaced with the other card and it also worked perfectly so pretty sure the cards aren't the problem.
So they work fine on their own but something goes tits up when try and use both.
They're 11GB cards and GPUZ shows max use of only 5GB so seems like it's not actually a Vram issue.
Power draw on the cards doesn't get above 76W so it's crashing before they even start working.
PSU is 1200W Gold
Any ideas why it now wont work with 2 cards but is fine with 1?
If I can work out how to roll back the Nvidia driver I'll give that a go.
Edit: Updated to the very lates Nvidia Studio driver. Still no use...
CUDA error (2) on device 1: out of memory
-> failed to allocate device memory
device 1: failed to allocate ai light updates buffer (3)
OptiX error for device 0: [ACCEL] Error launching command list (CUDA error string: out of memory, CUDA error code: 2)
Failed to build acceleration structure
OptiX API error for device 0: Device out of memory
OptiX error for device 0: [ERROR] "sbt->raygenRecord" is null
OptiX API error for device 0: Invalid value
device 0: RTX picking failed