I bought a used (Reference) Sapphire R9 290x and I have been having a lot of issues with it. When I try to play Minecraft at 2560x1440 with the Shaders mod, I only get >30 FPS and without the mod I only get >60, meaning my old R9 270 performed much better than it. I have it in Uber mode and it appears to stay "cool" (for this card, meaning temperatures in the 80s) while playing Minecraft because it does not detect it as a graphically intensive game. Attempts to overclock it by any more than a few Mhz have just resulted in black screens while smaller overclocks usually bring about screen tearing. Trying to mine cryptocurrency, even at an extremely low intensity, crashes my drivers (although fixing this is not my priority right now). How can I improve this card's performance in Minecraft or fix these driver issues?