2 videos cards but strange result?

Jeremion

Hello there,

I just added a second video card to go a little bit faster.... However I have a strange result :

2022-05-02 23:18:19.983 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CUDA device 0 (NVIDIA GeForce RTX 3090):    5772 iterations, 2.542s init, 415.558s render
2022-05-02 23:18:19.983 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CUDA device 1 (NVIDIA GeForce RTX 3080 Ti): 9228 iterations, 2.543s init, 416.043s render

Why the less powerful card makes twice more iterations ? Any idea ? The screen is attached to the Device 0, but still... This is all weird for me...

RL_Media

On my rig, the 0 is where you wanna put the more powerful card, not sure if yours is the same. If so, you got it set up optimally as far as I can tell.  As for the 3080ti doing almost double the iterations of the 3090, that's a bit of a head scratcher. If it keeps happenning on other scenes and renders, I might be a bit worried. It could possibly be luck, and it was just the 3090 ended up working on hard parts like hair and eye reflections, leaving the other one to knock out easier parts on that render.

Jeremion

RL_Media said:

On my rig, the 0 is where you wanna put the more powerful card, not sure if yours is the same. If so, you got it set up optimally as far as I can tell.  As for the 3080ti doing almost double the iterations of the 3090, that's a bit of a head scratcher. If it keeps happenning on other scenes and renders, I might be a bit worried. It could possibly be luck, and it was just the 3090 ended up working on hard parts like hair and eye reflections, leaving the other one to knock out easier parts on that render.

Hello, I checked and the 3090 is well in the right PCI slot. I tried an other scene, same thing :

2022-05-03 08:13:37.165 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CUDA device 0 (NVIDIA GeForce RTX 3090):    1548 iterations, 6.718s init, 249.455s render
2022-05-03 08:13:37.165 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CUDA device 1 (NVIDIA GeForce RTX 3080 Ti): 2207 iterations, 6.685s init, 249.472s render

 

Edit: I've made some tests, and installed GPU Z. Now, I think I know why : temperature. Because of it, the 3090 limits itself. I'll need to bring more cold inside!