If you want the fastest graphics engine for gaming on the planet, you basically have two choices: ATi's Radeon X800 XT or NVIDIA's GeForce 6800 Ultra. Each one has its strengths and weaknesses, and each one can dominate the other depending on the game or benchmark being run at the time. Until now, we had only reviewed one of each of these graphics powerhouses in retail form. Bjorn took a look at the HIS Excalibur X800 XT IceQ II VIVO LIMITED EDITION last month, and Scott reviewed the BFG Tech GeForce 6800 Ultra OC in July.