Marc Whitten, corporate vice president of Xbox and chief product officer for Xbox One, says Microsoft has increased the clock speed on the console's GPU by about 6.6 per cent.
Speaking on the latest Major Nelson podcast, Whitten outlined a number of changes to the system as it "gets close to the final performance envelope".
A mixture of optimisation software and initial conservative estimates has meant the GPU can reach 853mhz - effectively allowing developers to put more demand on the system.
"Since E3, an example is we've dropped in what we internally call our mono driver. It's our graphics driver that really is 100 per cent optimised for the Xbox One hardware," Whitten said.
"You start with the base Direct-X driver, and then you take out all parts that don't look like Xbox One and you add in everything that really, really optimises that experience. Almost all of our content partners have picked it up now and I think it's made a really nice improvement."
He continued: "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, an example of that is we've tweaked up the clock speed on our GPU from 800mhz to 853mhz."