Hi all. I Recently made the switch from a gtx 670 to an r9 390. I spent months being torn between that and a gtx 970 but finally settled on the 390 as it seemed faster in quite a few games and had 8gb of memory. I knew the card would draw more power but i have a 750w PSU, which is recommended so i bit the bullet. My CPU is a 3770k and i have checked and double checked and everyone is saying that even at stock (which mine is) it wont be a bottleneck. Unigine Heaven 4.0 and 3d mark benchmarks show the card running as it should be with the benchmark scores being nearly exact to the the reviews but every game i play the performance just seems to be off, i have tried GTA V and where every review for the card states at near max settings at 1080p i should be able to reach 60fps but im struggling to maintain that with some quite sharp drops to 30fps even with vsync off. I have the 2 performance killing options grass to very high and reflections to very high aswell. The worst offender however is Crysis 3. Its just a mess and doesn't even feel much faster than my gtx 670. Judging by this Eurogamer benchmark https://www.youtube.com/watch?v=jzqsT1nzSkw at 1080p and very high i should be pushing 60fps quite easily with only minor drops into the 50's yet for some reason on the same levels i am dropping to 30fps and can barely even keep 50fps even with vsync off. These benchmarks have v-sync engaged as well. Assassins Creed Unity also runs like ass but as i know that game is an un-optimised mess anyway i have just chalked it down to that. Strangley enough though the Witcher 3 seems to run as expected and im actually getting a very respectable framerate so i really don't know what is going on. All of these games are being run at 1080p and i have 8gig 1600mhz of system memory. Any help would be greatly appreciated. Thanks Edit: Just to add, i have set the power limit settings to +50% as well to mitigate any throttling issues and im defo not running any frame rate limiters or anything like that.