Lukas Jatczak Posted December 2, 2022 Share Posted December 2, 2022 Hi all. I'm trying to understand one issue with GPU rendering. I am comparing my two computers and I am getting strange results. 1st machine: DELL laptop with i9-9980HK and Quadro RTX 4000: CPU rendering - 30 seconds GPU rendering - 11 seconds 2nd machine: PC with intel Celeron G5905 + 2x RTX 3090 CPU rendering - 3 minutes 24 seconds only the first RTX 3090 - 21 seconds only the second RTX 3090 - 19 seconds both RTXes - 22 seconds The question is.... WTF? Is the Celeron in 2nd machine a bottleneck in GPU renderning? And why using both 3090s get the same speed as using only one? Common sense tells me that the 2nd machine should be 6 times faster! Link to comment Share on other sites More sharing options...
Nikolaos M Posted December 13, 2022 Share Posted December 13, 2022 (edited) Are you sure all GPU's are enabled? A factor here could be the upload time from the system to the GPU. If it's a small scene (like it seams it is) then the upload time could be a big chunk of the total time. Also, what's the motherboard and PSU of your system? Edited December 14, 2022 by Nikolaos M Link to comment Share on other sites More sharing options...
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