I could use some quick advice before I spent a chunk of money on a video card.
I’m a bit confused about how Cycles will cope with multiple video cards in one system, that are not the same model. Specifically, if one is an RTX card and one isn’t. I’m looking to buy a new video card, and don’t want to throw money at it in a way that won’t work as expected.
I have a GTX 1080. I get that if I throw, say, a 1060 in my machine along with the 1080, both will work in parallel and I’ll get faster render speed (but not double the speed, because the 1060 is slower). I’m also limited by the smaller of the two VRAM amounts. I actually did this as a test a while ago.
I know that an RTX card is required to use features like Optix denoising. But here is the key question… if I get an RTX 20xx card, and put it into my system along with the GTX 1080 I already have, will Blender be smart enough to do what it can on both cards, and then just use the RTX card for Optix?
Or will having one of my two cards not be an RTX card just tank the whole process and make me unable to use features like Optix at all?
I haven’t found a satisfactory answer to this, because all of the discussion of multi-gpu systems that I can find involves cards that are from the same generation.