Iray server stucks with 4 GPUs

plmad

Hi there! I had a new problem with Iray Server 2024.0.4 (03 Oct 2024). Hardware: i5 7400 on a Gigabyte GA-Z270-Gaming 3 with 16GB DDR4, 500GB M.2 SSD and 5 GPUS (a 3090 and 4 3080) running on Windows 10. Any combination of 3 GPUs works fine, server renders correctly, no problems. When I add a 4th GPU server stucks on "Initializing light hierarchy".

I've tryed every possible combination of GPUs, PCIe slots (x16, x4), drivers (studio, gameready, actually 566.36), tryed evre option in BIOS (Gen2, Gen3, auto, enable/disable onboard GPU, etc.). Also tryed to set Window's virtual RAM to twice of VRAM. Iray server stucks via LAN from Daz Studio 4.23.0.1 and also in it's own cornell_box test

Iray server don't hung or "tilt", I can cancel the job and start again, but it doesn't render. I've attached some logs. 

Thanks in advanced.-

EDIT: Enable/disable "Use CPU" option in Iray server's config make no difference

EDIT 2: New discover: Photoreal mode stucks/hungs but Interactive (Biased) mode works fine. 

EDIT 3: Installed last version (2024.1.0), same problem.

EDIT 4: I've downloaded Iray Server 3.3 334300.2780 trial for testing purposses and it renders fine with all the 5 GPUs. I'm starting to think there is a bug in 4.0 versions.

EDIT 5: I've downgraded DAZ Studio to 4.16.0.3 (for bridge compatibility with IRAY Server 3.3) and same error jejejeje! It's stucks in "Initializing light hierarchy" but cornell_box test has no problem to render.

EDIT 6: Upgrade to 32GB of RAM. Same results. It's stucks in the same place.

plmad

Here I've uploaded a screen capture where you can see the problem graphically: I have 5 GPUs. Any combination of 3 GPUs renders (cornell_box) fine without problems. If I enable a fourth GPU, any of them, the render stuks on "Initializing light hierarchy".