“We set aggressive targets for reliability, performance, yields, and noise. Those things always have to be balanced. We want this box to have rock-solid reliability,” he wrote on GAF.
“We want it to be DEAD quiet (and let me tell you, X1 is quieter than the new Xbox 360 we just released). And we wanted killer game performance. But those targets are in conflict with each other.
“What we’ve found through the development process is we were able to actually exceed our goals on the thermals and acoustics,” he added.
“This gave us headroom to increase the clock speed without any hit to noise, reliability, or heat, so we took the opportunity to bump the GPU. I get it’s only 6% or so, but that could translate to a few FPS in the real world.”