AMD's Athlon 64 FX-51

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AMD's Athlon 64 FX51 - Page 8

The Athlon 64 FX-51 Processor
AMD Drops the Hammer, On Your Desktop!

By, Marco Chiappetta
And Dave Altavilla
September 23, 2003

We also ran a series of benchmarks on only the Athlon 64 FX-51, using an early beta release of Windows XP 64-Bit Edition.  When looking at these scores, please keep a few things in mind.  First, remember that the early version of Windows XP 64-Bit Edition we used is nowhere near complete.  When the final product is released, it will most likely perform differently than what you see here.  Secondly, all of the drivers we used were also immature.  It will take some time before 64-Bit device drivers catch up to their 32-Bit counterparts, in terms of stability and performance.  Lastly, the benchmarks represented on this page are all of 32-Bit applications, that are not optimized for the Athlon 64 architecture, being run in WoW64 emulation mode.  WoW64 translates 32-bit calls into 64-bit instructions.  However, because the Athlon FX-51 processor can also run 32-bit apps natively, it's not an "emulation" mode, in the traditional sense.  These scores are here only to show you how Windows XP 64-Bit Edition performs today, in its early stage of development with a few legacy applications.

Windows XP 64-Bit Edition: Benchmarks With 3DMark2001
32-Bit Application: Synthetic DirectX Tests

The Athlon 64 FX-51's overall 3DMark2001 score dropped off sharply when we ran the benchmark on the 64-Bit Edition of Windows XP, in the neighborhood of 17%.  We should also mention that we were not using the same video drivers in this test.  The only 64-Bit Windows XP drivers we had available for our GeForce FX 5900 Ultra at the time were v50.40.  The 32-Bit score was obtained with the v51.75 Detonator FX drivers.

Windows XP 64-Bit Edition: Benchmarks With Quake 3 Arena
32-Bit Application: OpenGL Gaming

As you can clearly see, performance in Quake 3 Arena was also much lower on Windows XP 64-Bit Edition, but it's not because there is a problem with the Athlon 64 FX-51 or this OS.  The cause of this low Quake 3 Arena score is the immature v50.40 64-Bit NVIDIA graphics drivers.  In their current form, even though the option is available in the driver panels, disabling V-Sync does not work.  We've included these scores only to solidify the point, that there is still much work to be done with the 64-Bit version of Windows XP and the drivers for it.

Windows XP 64-Bit Edition: Benchmarks With XMPEG v5.02 Using DivX v5.1
32-Bit Application: Video Encoding

The Athlon 64 FX-51's video encoding performance with XMPEG also took a hit when we ran it on the 64-Bit OS.  Considering the fact that the OS and drivers we used in this test were in beta form and that XMPEG and the DivX encoder were both running with WoW64 translating the calls, the 16.3% drop in performance isn't all that drastic.  As the 64-Bit Windows platform matures, we fully expect all of these scores to significantly increase.

Native 32-Bit vs. 64-Bit Tests

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