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Pros: The Radeon HD 4850 is a beast
Cons: Despite Powercolor's claims to the contrary, this card does not support CrossFire.
Other Thoughts: I bought a pair of these Powercolor AX4850 512MD3-HV3 cards for my new build with the intent of running them in CrossFire. There is no place to connect bridge cables on these cards; they are manufactured without the necessary connectors.
I called Powercolor and was told that these cards do not need bridge cables to run CrossFire. I was told that the cards communicate over the motherboards PCIe bus, known as "software" CrossFire. I verified that I have the newest mobo and ATI drivers and I installed the latest version of Catalyst Control Center but no luck. CCC reports that I need to install bridge cables before I can enable CrossFire with my cards.
I wrote technical support for my mobo (ASRock 870 Extreme3) and they state categorically that my mobo does not support bridge-less CrossFire. I wrote Powercolor asking for a list of compatible/tested mobos, but so far I have not received a response. Bottom line: if you want CrossFire then pay more and buy someone else's HD 4850.