further to another post previously, I had 2x r9 280x's and had issues with them, ie screen jumping and constant crashing in x-fire, I thought it was a seating issue or drivers. they were the sapphire r9 280x dual x oc cards, but it turned out to be that both cards were knackerd, so my question is what do I get instead ? do I get 2 more 280x's or do I get 1 r9 290x ?. when the 280's worked the performance was fantastic, I just don't know in comparison what the 290x is like, I know if I buy the 290x I will save a bit of cash, or do I spend an extra £70 quid or so and buy a 780ti. whats your guys thoughts