The XFX Radeon HD 7790 Black Edition has several advantages over a regular HD 7790, a factory overclock of 75MHz to 1075MHz on the GPU and an effective 6.4GHz on the memory, of which there is twice the amount as a regular 1GB model.  To go along with the overclock is XFX's Double Dissipation custom cooling and components which they refer to as Duratec Professional Grade, which helped [H]ard|OCP reach speeds of 1230MHz GPU and 7GHz GDDR5 when overclocking with no noticeable change in temperatures.  This is rather impressive performance for a card who's smaller brother costs only $140 after MIR, the pricing of the 2GB model should be only $20 more than that.  Unfortunately for AMD, at the end of the day [H] cannot recommend this card over the euqally expensive but higher performing GeForce GTX 650 Ti Boost 2GB.

"Today we are strapping the XFX Radeon HD 7790 Black Edition to our test bench and pitting it against a GeForce GTX 650 Ti Boost. Each card is equipped with 2GB of GDDR5 and is attractively priced for the value minded gamer. The gloves will come off and we will find out whether the Black Edition is worthy of a Black Belt or a Black Eye."

Here are some more Graphics Card articles from around the web:

Graphics Cards