Microsoft
Even though the hardware specs of Microsoft's upcoming Xbox One console have been locked in place for some time now, the company is still apparently making tweaks. Microsoft's Marc Whitten, speaking on Larry "Major Nelson" Hryb's podcast, stated that current developer kits were using GPUs clocked at 853MHz, up from 800MHz in E3-era kits. This 6.63 percent performance increase isn't massive in the scheme of things, but the fact that Microsoft feels comfortable boosting the clock speed like this may be a sign that things are going well with the console's semi-custom AMD processor.
Whitten also said that the company has updated its graphics driver since the console was shown off at E3 and that its operating system was being tweaked and iterated on daily. At this point in the console's development cycle, software tweaks like these are far less surprising than changes to the hardware specifications, and it's a fair bet that these changes will continue until very near the console's launch.
Though the Xbox One's GPU has gotten a speed boost, it's still working from a disadvantage relative to the PlayStation 4. Sony's console sports 1152 AMD Radeon GPU shaders while Microsoft's has 768, and it will be difficult to close that gap using clock-speed boosts without totally blowing the console's power budget (current rumors suggest that the PS4's GPU clock speed is also 800MHz, same as the old Xbox One speed). In the past, consoles hardware configurations were so dramatically different that these kinds of comparisons were more difficult to make (and differences like the Xbox One's eSRAM and the PlayStation 4's GDDR5 memory?still complicate comparisons to some small extent), but the Xbox One and PlayStation 4 both use AMD chips with very similar architectures. Even so, any increase in power is welcome, and the Xbox One's beefy heat dissipation capabilities should be able to handle the bump.
Source: http://arstechnica.com/gaming/2013/08/microsoft-boosts-the-gpu-clock-speed-in-xbox-one-dev-kits/
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