There's nothing wrong with a little under-the-hood tweaking when it comes to the time running up to a console's launch. That's exactly what Microsoft's been doing with the Xbox One.
Marc Whitten was recently on an episode of Major Nelson's podcast, a show dedicated to gaming as it's related to Microsoft, in order to talk about the Xbox One. Whitten explained that, since E3, the Xbox One's GPU speed has gone from 800MHz to 853MHz.
Here's the full quote from Whitten during Hyrb's podcast. The fine folks at Gamespot transcribed it directly. Things get a little jargon heavy, so heads up if nerd words make your ears bleed.
"Since E3, an example is that we've dropped in what we internally call our mono driver. It's our graphics driver that really is 100 percent optimised for the Xbox One hardware. You start with the base [DirectX] driver, and then you take out all parts that don't look like Xbox One and you add in everything that really optimises that experience. Almost all of our content partners have really picked it up now, and I think it's made a really nice improvement.
This is the time where we've gone from the theory of how the hardware works–what do we think the yield is going to look like, what is the thermal envelope, how do things come together–to really having them in our hands. That's the time where you start tweaking the knobs. Either your theory was right dead on, or you were a little too conservative, or you were a little too aggressive. It's actually been really good news for us, and an example of that is we've tweaked up the clock speed on our GPU from 800MHz to 853MHz."
The Xbox One is set to release this holiday season. As more comes concerning the console, including any potential hardware tweaks, we'll have it.