This was done because it is way more practical. Rendering my characters in their respective scenes/backgrounds takes a lot of rendering power. Rendering characters and backgrounds seperatly and putting the characters on top of the backgrounds saves a lot of render time. I do not have a NVIDIA GPU so rendering with Iray is done purely on my CPU, which isn't very fast. I am planning on redoing/improving many of the renders when I finish the alpha version of the game. I hope that by that time I will have acces to a NVIDIA GPU, which are practically impossible to get for a normal price these days.
Even an "old" 1080 GPU will give a massive improvement in rendering speed. Think 20 times faster than CPU-rendering ballpark of how much faster it is. A 20XX (those are still available at some places, no need to get one second hand) will do great as well, the RTX 2070 is by all means comparable to the 1080 for rendering (except for the smaller VRAM, so there is still
some limit to the amount of crap you can put into a single scene, but with some clever use of textures and assets, it's usualy enough)
The RTX30xx series is obviously better than the RTX20xx series, but I do advice investigating whether the difference is worth the higher pricetag, or whether you can even get the finances in the foreseeable future. It's fairly probable that an RTX2060 Super or RTX2070 is perfect for what you do with it already.
The Daz forums have a
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, which is something entirely different from the game oriented benchmarking you find on other sites. For fun, do download the benchmark scene, and see how you fare on CPU. From that, you can roughly deduce the improvement you'd get from an NVidia card, and figure out which cards suit your needs, but also which cards might be over the top. Since yeah, it's cool to have a 3090, but is it *really* worth it?