So I sold my gtx 690, I paid 700 for it almost 2 years ago. I figured if I sold now I ended up getting 450 total after amazon fees, and then buy the 980 for 550. So I was just assuming that next time I upgrade whether it be a 990 or whatever, that the 100 bucks I spent I should be able to make up for by selling the 980 because the 690 will keep losing a lot of value. Plus the vram seems important and energy as well. Could always sli the 980. So anyone think that was a bad idea? Good idea?