I was going by general computing and not factoring in gaming. The jump from sandy to haswell is argued to be between 5%-35% depending on who's reviewing and which batch of Haswells they got. Your estimate of about 10% for gamers is probably accurate. As for graphics your right about the 50% thing. Again I was going of raw computing power. the gtx 980 vs the gtx 780 is more than twice as fast on initial release on raw calculations. With a 17% increase from the latest drivers of 780 to the earliest drivers of the 980 in overall gaming performance. With the expectation of the 15% efficiency gain for the 980 when they upgrade to the 980TI and the another 15% from when the new cards come out some time early next year, and another 15% for the TI upgrade those will get, we'll be seeing about a 45% increase by the end of 2016.