Today AMD launched their mid range HD 7700 series namely HD 7770 and HD 7750. Both graphics card are based on 28 nm Cape Verde graphic processor which is downscale from the “Tahiti” silicon. HD 7770 has impressive 1 GHz stock clock speed, it packs 640 shader units, 16 ROPs and 128 bit bus memory architecture with 1 GB GDDR5 memory. The mid range card requires single PCIE connector that has official TDP of around 80 watts.
On the other hand its little brother HD 7750 also based on 28 nm Cape Verde graphic processor which clocked at 800 MHz, it has 512 shader units,16 ROPs and similar memory architecture of 7770. HD 7750 doesn't require PCIE connector as its maximum TPD is only around 55 watts.
On launch day AMD Radeon HD 7770 and HD 7750 are priced and will be available as low as $159 and $109 respectively.
Here's some review links of HD 7700 series: