Except these were actually slower hardware. They were running Radeon x800 Pros. 16 pipe, 475MHz, 160 million transistor GPUs. Xenos is a 16 pipe, 500MHz, 232 million transistor GPU. So the real thing ended up faster, with more features to boot. And they even were from the same vendor!Just like how the Xbox 360's were running on 2 Power Mac G5's
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What they're using now to "demonstrate" Xbox One games is at least twice as fast as actual Xbox One hardware on the GPU side.