Futuremark PCMark04	Source: FutureMark

PCMark04 is the latest version of the popular PCMark series. PCMark04 is an application-based benchmark and a premium tool for measuring overall PC performance. It uses portions of real applications instead of including very large applications or using specifically created code. This allows PCMark04 to be a smaller installation as well as to report very accurate results.

Futuremark PCMark04:
Overall	Points	Ranking
Intel Pentium D 840 (WinXP 32/32 Bit)	6760
Intel Pentium D 840 (WinXP 32/64 Bit)	6669
AMD Athlon64 X2 4800+ (WinXP 32/32 Bit)	7037
AMD Athlon64 X2 4800+ (WinXP 32/64 Bit)	6914
AMD Athlon64 FX-60 (WinXP 32/32 Bit)	7580
AMD Athlon64 FX-60 (WinXP 32/64 Bit)	7613
CPU	Points	Ranking
Intel Pentium D 840 (WinXP 32/32 Bit)	6486
Intel Pentium D 840 (WinXP 32/64 Bit)	6508
AMD Athlon64 X2 4800+ (WinXP 32/32 Bit)	6806
AMD Athlon64 X2 4800+ (WinXP 32/64 Bit)	6796
AMD Athlon64 FX-60 (WinXP 32/32 Bit)	7329
AMD Athlon64 FX-60 (WinXP 32/64 Bit)	7288
Memory	Points	Ranking
Intel Pentium D 840 (WinXP 32/32 Bit)	5344
Intel Pentium D 840 (WinXP 32/64 Bit)	5344
AMD Athlon64 X2 4800+ (WinXP 32/32 Bit)	5468
AMD Athlon64 X2 4800+ (WinXP 32/64 Bit)	5433
AMD Athlon64 FX-60 (WinXP 32/32 Bit)	5605
AMD Athlon64 FX-60 (WinXP 32/64 Bit)	5645

PCMark04 is a 32-bit application. As such it is not able to differentiate between a 32 and 64 bit environments, so the results are pretty consistent across the board for each pair of 32-bit/64-bit operating system tests.

Futuremark PCMark05	Source: FutureMark

PCMark05 is a premium tool for measuring both normal home use and simple 3D performance of the latest PC hardware. There are 11 system tests - each one is designed to represent a certain type of PC usage. By running these tests, PCMark05 stresses the components in a similar manner as they are stressed in normal home usage.

Futuremark PCMark05:
Overall	Points	Ranking
Intel Pentium D 840 (WinXP 32/32 Bit)	5732
Intel Pentium D 840 (WinXP 32/64 Bit)	5221
AMD Athlon64 X2 4800+ (WinXP 32/32 Bit)	4212
AMD Athlon64 X2 4800+ (WinXP 32/64 Bit)	3974
AMD Athlon64 FX-60 (WinXP 32/32 Bit)	4416
AMD Athlon64 FX-60 (WinXP 32/64 Bit)	4249
CPU	Points	Ranking
Intel Pentium D 840 (WinXP 32/32 Bit)	5309
Intel Pentium D 840 (WinXP 32/64 Bit)	5300
AMD Athlon64 X2 4800+ (WinXP 32/32 Bit)	4944
AMD Athlon64 X2 4800+ (WinXP 32/64 Bit)	4925
AMD Athlon64 FX-60 (WinXP 32/32 Bit)	5179
AMD Athlon64 FX-60 (WinXP 32/64 Bit)	5250
Memory	Points	Ranking
Intel Pentium D 840 (WinXP 32/32 Bit)	4201
Intel Pentium D 840 (WinXP 32/64 Bit)	4173
AMD Athlon64 X2 4800+ (WinXP 32/32 Bit)	4087
AMD Athlon64 X2 4800+ (WinXP 32/64 Bit)	4083
AMD Athlon64 FX-60 (WinXP 32/32 Bit)	4216
AMD Athlon64 FX-60 (WinXP 32/64 Bit)	4233

PCMark05 reacts just like PCMark04. It should be no surprise then that while the OS might be 64-bit, a 32-bit application will perform almost exactly the same as it would in a 32-bit operating system.