Originally released in 2009, the AMD HD58xx series graphics card quickly gained popularity due to their ability to fully support DX 11, providing a completely new level of tessellation. Released in October of 2009, the HD5850 filled the lower end of the performance slot and was able to deliver great performance for its price. Originally, the HD5850 was oriented towards users who wanted that extra punch, but didn't feel the need to go overboard with their graphics. However, for those that wish to take full advantage of the HD5850, CrossFire is available, and considering the low price of the graphics card, this should be easily accessible.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips