Yer my lil brother has a 570 + 2500k running at 1920x1080 on Ultra but I've noticed the occasional drop to 20-25 fps at some very intensive moments. To be fair, that rarely ever happens but still, lol ;p
Same here but mine does it a few times in a match. Turned AA off and its fine now, must be the lack of Vram causing it.
@ Game Over cool, try getting a 1080p monitor mate, it'll be much better PQ wise
