Someone is selling me his XFX 7770 ( http://pcpartpicker.com/part/xfx-video-card-fx777aznbr ) for $100 and he is telling me it is a better version of the regular Ghz version from XFX ( http://pcpartpicker.com/part/xfx-video-card-fx777aznj4 ) but I can't seem to find any info on his card because only Best Buy seems to be selling it and there aren't many reviews on it. Can someone with better experience tell me there is a big performance boost if I get his card rather than a normal 7770 Ghz edition card or is this card defective or discontinued?