Not only the Sapphire GTO² can be modded, the regular GTO cards from Connect 3D are also moddable. However, the success rate is unknown. If you try this mod, please let me know of your results.
Success 43 : 1 Failed (last update Oct 28 2005).
The steps to do the mod are exactly the same as the Sapphire GTO² mod outlined on page 2.
You just use another Bios.
However, there are some drawbacks compared to the Sapphire GTO² cards:
1. Sapphire uses faster 1.6ns memory, while Connect3D uses only 2.0ns.
2. Sapphire uses a guaranteed R480 core, while Connect3D uses only R423.
theres your answer as to why to go with a GTO2 atpbx. some other GTO`s have indeed been modding but its pot luck as to whether or not they will, and they more than likely will come with slower memory and an older GPU.
i realise it says "Success 43 : 1 Failed" with regards to the GTO but this isnt very accurate. there have been at least 3 unmoddable GTO`s here on these forums, and a handful more across anandtech forums and techpowerups forums, it seems that if it doesnt mod people get dissapointed and cant be arsed to report it so that they can keep an accurate count