XFX Radeon HD 7770 Black Super OC Double DissipationXFX, visibly very active with the Radeon HD 7000 series, is marketing three versions of the Radeon HD 7770 using its Double Dissipation cooling system:
Radeon HD 7770 Double Dissipation Edition: 1000/1125 MHz
Radeon HD 7770 Black Edition featuring Double Dissipation: 1095/1125 MHz
Radeon HD 7770 Black Super OC Edition featuring Double Dissipation: 1120/1300 MHz
The last model was supplied to us by XFX:
The card uses the reference PCB, which is however made by XFX. It's therefore still in the relatively compact 21cm format, but is a double slot. It has the same connectivity introduced with the Radeon HD 7900s, namely: a DVI Dual Link, a 3 GHz HDMI 1.4a out and two mini-DisplayPort 1.2 outs.
The PCB is rather pared down and of sufficient size for the positioning of the cooling system. There are three phases for the GPU and an additional phase for the Hynix T2C GDDR5 memory certified at 1.25 GHz. It requires a 6-pin PCI Express power supply connector.
Note that the GPU packaging is slightly different on the XFX model: there’s a protection that you won’t see on the reference cards.
This model stands out for its cooling system. The Double Dissipation cooler used here consists of a copper base to which a wide aluminium radiator is fixed, cooled by two 8cm axial fans. A brushed aluminium casing has been built around the card and gives it a very nice look.
With respect to overclocking, we managed to modify the GPU voltage to obtain the following (GPU clock / memory clock @ GPU voltage):
1120 / 1300 MHz @ 1.150V
1120 / 1300 MHz @ 1.174V: 79W (by default)
1150 / 1400 MHz @ 1.174V
1175 / 1400 MHz @ 1.200V
1200 / 1400 MHz @ 1.225V
1225 / 1400 MHz @ 1.250V: 106W
XFX supplies its card with an installation guide for the card and drivers, a CD for the drivers, a product registration code, a brand insignia, an HDMI to DVI adaptor, a DVI to VGA adaptor and a CrossFire X bridge. It should be available soon for €170.