I still don't understand why he is engaged in rendering on 6 3090, when professional Quadro series graphics cards (with a large amount of video memory and the number of CUDA cores) are more suitable for such tasks.
Because there's virtually no reason to do it. You actually don't need e.g. Quadro GPU A6000 for rendering all that much except for the extra VRAM, but it's nothing 2 x 3090s can't do (you get the same VRAM + if we take the MSRP of both cards, it's more price efficient to actually go for 2 x 3090s rather than a single A6000), and CUDA cores of both are at 10K, so that's the same. For rendering efficiency, 3090 is the best option as it actually renders faster than an A6000. For other reasons (Dl, ML, etc.), however, A6000 would be the better option.
DPC has 8 x 3090 GPUs which is probably the best workstation around for an AVN developer, you can't really top that with the technology and GPUs which are available now. Moreover, allegedly there will be a new series of Nvidia GPUs in 2022 (the RTX 4000 series -
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).
Therefore, I see no reason for DPC to upgrade his workstation now (there's basically nothing to upgrade to though, but still).
I am willing to bet that DPC would be willing to get his hands on some of those new GPUs in 2022 immediately as they come out to have the technological advantage again, so anytime he expands, it should be exciting because he reinvests a lot directly back in the game (hardware, music, assets, etc.), and I don't think it will be different when the new GPUs will be released