So I just recently bought a new HIS radeon 7870 gpu from newegg and was really excited to try it out on crysis 3, however, it performs absolutely terribly, i have to turn everything down to "low" just to get a respectable frame rate. Moreover, my roommate has a xps 7870 and can max out all graphics settings. Ive checked my drivers repeatedly and even dabble in OC but nothing really works. Can anyone explain this or help me get more performance out of my card?