Byte Sized Reviews posted a review on the HIS X1800GTO IceQ3 Turbo 256MB Video Card

The card itself is really massive as previously mentioned, and uses the same PCB as the X1800XL. This is not true for X1800GTOs from other manufacturers which have one less mosfets on the PCB. This made us think that the X1800GTO from HIS could possibly be unlocked to all 16 pipelines without too much difficulty – more on this later.

HIS X1800GTO IceQ3 Turbo 256MB Video Card Review