Recently got a great deal on a R9 295X2 but I am having some trouble with it. Would an Antec 850 HPC be powerful enough - http://www.antec.com/product.php?id=706572&fid=358&lan=ec - The rest of the PC is a 3930K Asus P9x79 Pro mobo - no real overclocking. The main issue is at boot with displays not working etc.