Originally Posted by
Triggered Fridgekin
If both are the same price then I'd sooner recommend the 1660 even with the potential loss to adaptive sync. Having 2GB less isn't something to lose sleep over by any means but in either case you may well be hitting the FPS cap depending on the game and settings. Overclock the 1660 and it'll only further the distance between the two since, IIRC, the 590 doesn't have much leg room and already runs hot. The 590 really needs to hug $200 to be more appealing.
This is assuming it fits your budget. Otherwise you can look at the 580/1060 and lose, like, 10% performance.