Hi Seba. Well the reason for selling is i had 2 crossfiring them. I was happy with that and they worked nicely. But one of them went wrong (and was so new it was still under warrentee) so overclockers sent me a XFX Radeon HD 5750 and the cross fire wont with a 5750 and a 4850 so i have ordered another 5750 to cross fire again.
I didnt want to loose the 4850's but im left without a choice TBH. Great cards. And the one im selling is mint with orignal boxing, and software.
If you have 2 PCI-E slots on your mobo you could buy this one off me and enter the world of crossfire thats one of the best upgrades you can do!