For AI training 4090 is more efficient by quite a lot. Trade for a 4090 if you have the money for it and a good enough rig. Otherwise the 24GB VRAM of a 3090 is

For AI training 4090 is more efficient by quite a lot. Trade for a 4090 if you have the money for it and a good enough rig. Otherwise the 24GB VRAM of a 3090 is good and having more system RAM/disk helps more instead of a 4090. https://www.pugetsystems.com/labs/hpc/nvidia-rtx4090-ml-ai-and-scientific-computing-performance-preliminary-2382/ https://www.pugetsystems.com/labs/hpc/nvidia-rtx4090-ml-ai-a... https://lambdalabs.com/blog/nvidia-rtx-4090-vs-rtx-3090-deep-learning-benchmark https://lambdalabs.com/blog/nvidia-rtx-4090-vs-rtx-3090-deep...