Hay Simple question, really. I'm in the market for a new system minus the GPU. I have a g-sync screen and I'm looking into the Valve Index, so higher FPS is preferable. Thus, I'd like to go SLI with a 2nd hand card. Problem is, I hear less and less games and even drivers are SLI optimised. Some even reported SLI barely working with the 20x0 series. Do I have to worry?