The Chinese website HKEPC Hardware has discovered an interesting fact about ATI's Radeon X1800 GTO graphics card: while advertised as a 12 pipeline part, it's possible to unlock some cards to 16 pixel pipelines by flashing them with a Radeon X1800 XL BIOS. This is no surprise, since the X1800 GTO and X1800 XL both use the same R520 core, but such unlocking is not always successful.

The TechReport