no worries. i seem to forget something..
techPowerUp! :: Video Bios Collection
and get those(1gb i guess your card is)
compare them.
what i would, though, is tweak the stock one. gives you more chances of it working as long as you don't touch mem timings and stuff like that.
techPowerUp! :: VGA Bios Collection: ATI HD 5870 1024 MB Updated BIOS provided by ATI
GPU Device Id: 0x
1002 0x
6898 113-C00101-103 CYPRESS XT GDDR5
32Mx32 MARVIN BIOS UCODEv:120 (C) 1988-2005, ATI Technologies Inc. ATOMBIOSBK-ATI VER012.014.000.005.035264
S3C00101.103