Hi Tom Foster
RC use GPUs for calculating depth maps and etc. and its need CUDA 2.0 so no need for specialised OpenGL or etc extensions ( what are always enabled btw ) and the “gaming” GPUs are clocked much higher as Quadro cards ( speed difference about 20+% ) on same GPU. ( Quadro and Gaming GPU are absolutely the same, just different naming and quadros have enabled some aditional functionalities. So from hw perspective its the absolutely same hw.
Many people use dual or triple GPU setup to get best price-performance ratio, 4th GPu give max 10-15 % speedup, as there is the PCIE-latency issue.