Wow what a day you had!!! Device Manager will show you 2 hd5900 series. Use GPUZ. at the bottom click on ATi Radeon HD 5900 Series. If it shows 2 "ATi Radeon HD 5900 Series"then you have both GPU's working if not then you have only flashed the Master GPU and not the slave. Did you use the BIOS I left to flash in windows? If so you should be able to flash properly from DOS. When you flash in Dos check the PN no. and the new Bios version which should be XXX TEST XXX. If you do not see this after you have flashed, then the flash did not work. Simon.