Hello. I recently bought a Sapphire Pulse RX 580 8GB card. This card has a dual BIOS switch (Gaming or Compute). The Compute mode is for mining and the paper tha comes with it says tha it may be unstable in gaming. The thing is that the card doesn't boot in gaming mode, only in compute. I've searched a lot and i think that the problem is that my rig is from 2011 and my mobo doesn't support pci express 3.0 (only 2.0). I have upgraded again in the past with a Gigabyyte OC Gaming gtx 960 4GB with no problems. Can anyone help please? Thanks in advance. My pc specs are: i7 2600k , sapphire Pure Black p67 Hydra (mobo), 8gb Ram, Cooler Master Silent Pro 850W (Bronze) .