Mini-GZIP	Source: zlib

The Mini-GZIP benchmark contains both 64-bit benchmark that measures the performance of an AMD64 optimized version of ZLIB. It also contains a 32-bit benchmark implemented with the standard (unmodified) ZLIB. Lower is better.

Mini-GZIP
Processor	Seconds	Ranking
Intel Pentium D 840 (WinXP 32/32 Bit)	10.47
Intel Pentium D 840 (WinXP 64/32 Bit)	10.47
Intel Pentium D 840 (WinXP 64/64 Bit)	6.25
Intel Pentium D 940 (WinXP 32/32 Bit)	9.28
Intel Pentium D 940 (WinXP 64/32 Bit)	9.28
Intel Pentium D 940 (WinXP 64/64 Bit)	5.83
AMD Athlon64 4000+ (WinXP 32/32 Bit)	8.14
AMD Athlon64 4000+ (WinXP 64/32 Bit)	8.13
AMD Athlon64 4000+ (WinXP 64/64 Bit)	3.69
AMD Athlon64 FX-60 (WinXP 32/32 Bit)	7.64
AMD Athlon64 FX-60 (WinXP 64/32 Bit)	7.62
AMD Athlon64 FX-60 (WinXP 64/64 Bit)	3.31
AMD Athlon64 X2 5000+ (WinXP 32/32 Bit)	7.83
AMD Athlon64 X2 5000+ (WinXP 64/32 Bit)	7.82
AMD Athlon64 X2 5000+ (WinXP 64/64 Bit)	3.47
AMD Athlon64 FX-62 (WinXP 32/32 Bit)	7.28
AMD Athlon64 FX-62 (WinXP 64/32 Bit)	7.28
AMD Athlon64 FX-62 (WinXP 64/64 Bit)	3.12

We see similar results with the 64-bit capable Mini-GZIP benchmark. The time it takes to complete the test is greatly reduced with a 64-bit platform. The Athlon64 FX-62 is fastest here, followed by the X2 5000+ with the FX-60 in a close third.

DiVX Encoding	Source: PCStats

The DivX encoder benchmark contains both a 32-bit and a 64-bit benchmark that measures the performance of raw video encoding of the AMD optimized DivX video encoder version 503. The encoder has been optimized for AMD Athlon 64 and AMD Athlon 64 FX systems (both 32-bit and 64-bit). Lower is better.

DIVX Encoding
Processor:	Seconds	Ranking
Intel Pentium D 840 (WinXP 32/32 Bit)	12.435
Intel Pentium D 840 (WinXP 64/32 Bit)	12.435
Intel Pentium D 840 (WinXP 64/64 Bit)	10.42
Intel Pentium D 940 (WinXP 32/32 Bit)	10.462
Intel Pentium D 940 (WinXP 64/32 Bit)	10.461
Intel Pentium D 940 (WinXP 64/64 Bit)	8.85
AMD Athlon64 4000+ (WinXP 32/32 Bit)	9.813
AMD Athlon64 4000+ (WinXP 64/32 Bit)	9.827
AMD Athlon64 4000+ (WinXP 64/64 Bit)	7.116
AMD Athlon64 FX-60 (WinXP 32/32 Bit)	9.571
AMD Athlon64 FX-60 (WinXP 64/32 Bit)	9.565
AMD Athlon64 FX-60 (WinXP 64/64 Bit)	6.958
AMD Athlon64 X2 5000+ (WinXP 32/32 Bit)	9.622
AMD Athlon64 X2 5000+ (WinXP 64/32 Bit)	9.635
AMD Athlon64 X2 5000+ (WinXP 64/64 Bit)	7.031
AMD Athlon64 FX-62 (WinXP 32/32 Bit)	9.156
AMD Athlon64 FX-62 (WinXP 64/32 Bit)	9.205
AMD Athlon64 FX-62 (WinXP 64/64 Bit)	6.347

By its very nature, DiVX encoding is system limited. It's not much of a surprise to discover this benchmark performs best in a 64-bit environment, and on the Athlon64 X2 5000+ or FX-62.