Well, now I have only one, the other died. The two had the same bios with unlocked core to 990. Thanks for all TerraRaptor, I will seek another 4870 and I will try again, but look that, are very different
http://www.ixbt.com/video3/images/rv770-4/powercolor-4870-scan-front.jpg
http://img218.imageshack.us/img218/8306/powercolorradeonhd4870s.jpg
But i will try again.
Thanks