I have a Sapphire HD 7970 3GB reference design card. I play a lot of NBA 2K16 and the card started acting funny- extreme slowness in menus, some of which are rendered, some are just 2D, impossible to even get into a game. I thought it was dying, so I purchased Sapphire HD 7970 3GB Dual-X OC. I've been playing NBA with the Dual-X card and other games for months now- most recently No Man's Sky and Fallout 4 and forgot all about the original reference card. Out of interest I took the Dual-X out and put the reference card in... the reference card played No Man's Sky and Fallout 4 perfectly fine.. hours without any issue. As soon as I fired up NBA 2K16, it did it slow thing again. Same drivers, same hardware setup, same underlying gpu. Tried a google and more concerning glitches with the NBA 2K16 itself (which should be universal to all cards/setups.. not just a specific one?) Other hardware- G1 Sniper M5 Motherboard and Intel i5 4590 and otherwise pretty normal system. What is going on? any thoughts appreciated.