Quite a few X1800GTOs can't be unlocked
 

We asked several readers and retail shop reps to come back to us with results of their testing. The best unlocker is allegedly the X1800GTO manufactured by Connect3D or HIS. A PC manufacturer claims every Connect3D card was safely unlocked to X1800XL, which supported the claim of our reader. With HIS, many of the cards can be unlocked, but not all. However, the Sapphire boards can't be unlocked, it appears.