There's in fact
2 new hotfixes, that one you listed above is some sort of a new patch, didn't impact on speed for me (unsure if there's any noticable difference in any way yet) but this one gave a 1~4% increase depending on application (already had the old hotfix installed):
http://www.microsoft.com/downloads/d...8-34FB8A0FCE3B
Overview
Install this update to fix a situation where your Windows-based system that supports processor power management features, and is equipped with multiple processors, may experience decreased performance. After you install this item, you may have to restart your computer.
It's both for Intel and AMD, is replacing the old "WinXPdualcorehotfix.exe" and I've heard it helped some Conroe owners already too.
And here's some "real-world" comparision using PCSX2 PS2 emulator which IMO is the perfect test as this emulator is very CPU dependant in majority of the games (and RAM latency / tight timings matters somewhat too) while gfx card can even be downclocked severly in lots of games without an FPS drop depending on CPU & gfx card combo, thus making it a perfect test for changes that applies to CPU performance:
before
after
(That's from FF12 FYI)
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