No the X800 and X800XL do have the same core. R430 that is.

This is why my X800 is flashable: http://www.theinquirer.net/?article=20657

Although I am yet to find an Xpertvison (or Palit) X800XL bios (because they do not make X800XL's). I am now going to try and flash it to an X800pro BIOS to help my overclock.

But again I cant find the X800Pro BIOS for an Xpertvision (or Palit). If anyone has a PCIe Xpertvision (or Palit) X800Pro could they please save the BIOS and PM Me. Cheers.