Enter the XFX HD 7770 Black Edition. With an improved over stock clockspeed of 1120MHz on the core (120MHz faster than reference HD7770) and a huge boost on the memory clockspeed to 1300MHz (5200MHz effective), the Black Edition 'S' (Super Overclock) arrives pre-overclocked which should give the card a fair boost in performance. Couple this with XFX's fantastic Double Dissipation cooler complete with GHOST thermal technology and the XFX may just make the successor to the HD5770/6770 a worthwhile purchase. Being a custom cooled, pre-overclocked card, the XFX R7770 Black Edition does carry a premium over reference cards. The XFX R7770 builds on an already fast clockpeed of 1GHz so to increase that speed any further is a feat in iteself, however XFX have managed just that and added a further 12% to the core along with increasing the memory clockspeed to a quite frankly ridiculously fast 1300MHz(5200Mhz effective). Thanks to the Double Dissipation cooler, the XFX graphics card ran very cool at both idle and load. Even the blistering overclock we achieved did not phase the cooling and even better, the fan speed hardly increased past audible levels such is the performance of the GHOST technology. Source
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