HD2900 to mod w/ XP64 drivers walk through I got it to work. I edited post with correct steps added. Successfully modded my HD2900XT card for XP64. I used this this guide for (see steps 1-12 below): http://ocmania.com/index.php?showtopic=45&pid=58&st=0& 1- Install riva tuner V2.09 2- Intalled to AMD directory 8.453.1 drivers for Windows XP x64 Link to drivers: http://www.solidworks.com/downloads/videocarddriver/ati/firegl_8_453_1_xp64_063074.exe 3- in 53846.inf ("erase every PCI VEN ID u may find") replace with device ID, this is now what is in my CA_53846.inf [ATI.Mfg.NTamd64] section "ATI FireGL V8600" = ati2mtag_R600GL, PCI\VEN_1002&DEV_9400 "ATI FireGL V8650" = ati2mtag_R600GL, PCI\VEN_1002&DEV_9400 ; 4- Copy ati2mtag.sy_ at C:\AMD\Driver\XP_INF\B_56046\ to desktop 5- Create patch.rts from Shocko's x64 script. Link: http://forums.guru3d.com/showthread.php?t=261154 Per Shocko's Post 6- change device ID in the line starting with "dst" lower section of script that corresponds to the card at the top of script. Dst6_6 = 66 c7 44 24 32 00 94 0F B7 54 24 32 90 90 90 90 90 90 90 In the script above it is allready there it seems.. this took me a while to understand heh.. 7- Open patch.rts with RT and select force AMD FS V8600 or 8650 8- Click next select ati2mag.sy_ from desktop and execute patch 9- run cmd, cd desktop, type makecab ati2mtag.sys 10- copy back ati2mtag.sys and atimtag.sy_ to \AMD\Driver\XP_INF\B_56046 11- uninstall ATI driver in add remove programs. (none since fresh install) 12- restart PC and device manager point video card to C:\AMD\Driver\XP_INF Thats it.