Gigabyte has released a new revision of its overclocked Radeon HD 7770 graphics card (GV-R7770OC-1GB). In terms of appearance, the card is identical to the original model, but remarkably enough, the clock frequencies have been lowered. Instead of an 1100 MHz core speed and effective 5000 MHz frequency for the 1 GB of GDDR5 memory, this second revision comes clocked at respectively 1050 MHz for the core and 4500 MHz for the memory.
The decreased clock frequencies make the card almost 5% slower, a peculiar decision by Gigabyte. It's possible that it was too difficult to find sufficient GPUs that would operate at 10% above the reference clock frequencies, or that the energy consumption of the card may have been too high. It's expected that the second revision of the GV-R7770OC-1GB will have the same pricetag as its predecessor. The card features a dual-slot cooler and four video outputs (1x DVI, 1x HDMI and 2x mini DisplayPort). Like the original version, the card is powered by a single 6-pin PEG connector.
New revision of GIgabyte's HD 7770 OC has lower clock frequencies (Source: Videocardz)