so ive been looking around for a graphics card and ive decided to get the radeon 7790 because it just fits my price range and it looks like the best bang for my buck. but i searched it on newegg and many different companies such as Spaphire, MSI, PowerColor, HIS, VisionTek, etc. how so i know which one will be the best, or are they all the same with different coolers? are some of them more power efficient or have different ports? thanks in advance