The back to school season is coming in the U.S and ATi looks all set to take full advantage of it with the Radeon HD4680. The HD4680 graphics card is based on the RV790 core and uses 512MB of GDDR5 memory and is equipped with 640 stream processors and the memory bus bandwith is limited to 256bits. The default core/memory frequencies are 700 and 3000MHz respectively. We should keep in mind here that the clock speed of HD4680 is quite low as compared to that of the HD4890 and since both the cards use GDDR5 memory, this card has an awesome overclocking potential.
The card also has a 6pin additional power connector. There is no work on the pricing but the card should cost anywhere between $140-180 USD