Originally Posted by msxyz
AGP8X and AGP4x interfaces are both physically and electrically different
Bwah? Not that I know of. The AGP3.0 spec is a superset not a replacement for AGP 2.0. The slots are identical. Perhaps you can explain what you mean.
The NV25 GPU was Ti4x00 AGP4x and NV28 was Ti4x00 AGP8x + bugfixes over NV25. You can't flash a bios on a NV25 card and magically get AGP8x.