Question Using a 4090 and a 3080 together for rendering ?

[buffdezines]

So I'm currently running my 3080 rig with Ryzen 3900x, 128gb ram, Taichi X570 and an 850watts Psu
is there a chance to upgrade my system and use a 4090 along with my current rig?
Or will i experience a bottleneck with both my cards while rendering with Redshift and Blender
I saw someone using a similar build with great results inside Redshift
But he's using a 5950x instead
Any help will be appreciated
TIA

 

[Aeacus]

and an 850watts Psu

For RTX 4090 alone, 1.2 kW (1200W) PSU is what i'd consider. But since you already have RTX 3080 in there, 1.6 kW PSU is what i'd be looking towards.

Also worth considering is Quadro (Nvidia) or FirePro (AMD) GPU, since while GeForce/Radeon is designed and built for gaming use, Quadro/FirePro is designed and built for workstation use (3D rendering and the like).

Now, Blender seems to favor GeForce GPUs, especially since RTX 4090 is miles better from single Quadro RTX A6000,
link: https://opendata.blender.org/

However, Redshift favors Quadro/FirePro instead,
link: https://www.pugetsystems.com/recomm...ems-for-Redshift-195/Hardware-Recommendations

And going with Quadro, you can add several Quadro GPUs within your system (e.g 4x A6000), while having one 1.6 kW (1600W) PSU. With GeForce GPUs, you can only have two in the system (3080 and 4090) to essentially max out the PSU. And there is 0 word about both GeForce GPUs (3080/4090) actually playing ball and working together with workstation loads. However, Quadro GPUs will work well with each other, since they are designed to work together. Three or four Quadros together is common. Not to mention the huge VRAM amount you get with those, 48 GB per one Quadro RTX A6000. And the Quadro VRAM also has ECC. Something GeForce GPU does not have (since it doesn't need it, for gaming use).

So, give a good look towards Quadro.