If frame rate performance was equal, which solution would make more sense: buying one expensive high-end video card, or combine two budget-priced middle-market video cards for less than the high-priced unit?
For most consumers, when all things are equal, it comes down to cost. That's the message in this article: don't pay more unless you're getting more.
Because the truth is that two ATI Radeon HD 4770 video cards can be combined into a CrossFireX set and perform better than more expensive alternatives - at less than half the price.
The Sapphire Radeon HD 4770 introduces the 40nm RV740 GPU paired to 512MB of DDR5 video frame buffer memory, and a double-height cooler allows the 100277L model video card to operate at 750MHz.
As of May 2009, the Sapphire HD4770 sells for as low as $99, which allows gamers to create a very affordable CrossFireX array using this mainstream graphics accelerator.
You can read the rest of the article over here.