[Artigo] Overclocking and WindowsXP x64 Edition @ PCStats

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http://www.pcstats.com/articleview.cfm?articleID=1825

Like its 32-bit counterpart...

The first thing we noticed when testing in the 64-bit world was that the test system could not overclock as high as when it was using the 32-bit version of WindowsXP. With the 32-bit OS, the AMD Athlon64 4000+ processor could overclock as high as 2.72 GHz (Prime95 stable). When WindowsXP x64 Edition was installed, the system would only run stable at an overclocked speed of 2.64 GHz. We're not sure where the limitation is... perhaps 64-bit registers require something more stable than even Prime95 can detect.

During testing, we generally noticed a similar performance boost due to overclocking in both WindowsXP x64 Edition and its 32-bit WindowsXP counterpart. There were a few differences however. We noticed some weird Multimedia numbers in SiSoft Sandra 2005 (64-bit compatible) as well as low Doom 3 scores. This could be due to immature drivers or the operating system itself.

Despite the odd numbers from SiSoft Sandra, CPU crunching applications like Super Pi, piFast and ScienceMark and games like UT2003/UT2004 were all very close in terms of performance. When comparing 32-bit applications to 64-bit apps, we also noticed some substantial gains from using WindowsXP x64 Edition, especially in ScienceMark 2.0, MiniG-ZIP and in DiVX encoding - heavy duty number crunching applications.

If you're running a Microsoft WindowsXP PC based on a 64-bit compatible CPU from AMD (or Intel), and are thinking about jumping onto the new wave of 64-bit OSes with WindowsXP x64 Edition, these overclocking results are definitely something to consider. The move may or may not improve overall system performance, the answer to that is based both on the applications you run and whether you can achieve an equivalent overclocked speed.

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[X3non-RM]

Confirmo. Com o XP 64 para além de a temperatura do CPU aumentar alguns graus, os resultados de overclock são miseráveis.
Por exemplo o meu Venice faz pouco mais de 2000 Mhz no XP 64 bits.

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