Two things. Make sure you’re running the latest version of the nvidia driver. And try running resolve 8.2.1.
Generally speaking using larger than 2k images requires all the GPUs to have 2GB+ of RAM. So that could be the cause of your problem, how ever it’s worth checking bother software updates first to male sure. If you do need to upgrade the GPU, even a single 580/3gb card will give you similar performance to what you’ve been seeing,
Last thing is that it seems from your config, it would behoove you to move the red rocket into a slot inside of your Mac pro. It seems like you didn’t list all the cards in your computer, but if you have a slot available that’s where I would put it.
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