Futuremark PCMark05 1.2.0	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.

PCMark05:
Overall	Points	Ranking
2GB Kit Corsair DOMINATOR Twin2X2048-8888C4DF (200/800)	7363
4GB Kit Crucial PC2-6400 (200/800)	7315
4GB Kit Mushkin XP2-6400 (200/800)	7355
4GB Kit Mushkin XP2-6400 (200/1130)	7536
Memory	Points	Ranking
2GB Kit Corsair DOMINATOR Twin2X2048-8888C4DF (200/800)	5457
4GB Kit Crucial PC2-6400 (200/800)	5354
4GB Kit Mushkin XP2-6400 (200/800)	5428
4GB Kit Mushkin XP2-6400 (200/1130)	5843

PCMark05 results show little difference between 2GB and 4GB memory kits under Windows Vista 64-bit, however the Mushkin XP2-6400 memory has no problems keeping up with the speedy Corsair DOMINATOR Twin2X2048-8888C4DF memory.

FutureMark 3DMark06 1.0.2	Source: FutureMark

3DMark06 is the worldwide standard in advanced 3D game performance benchmarking. A fundamental tool for every company in the PC industry as well as PC users and gamers, 3DMark06 uses advanced real-time 3D game workloads to measure PC performance using a suite of DirectX 9 3D graphics tests, CPU tests, and 3D feature tests. 3DMark06 tests include all new HDR/SM3.0 graphics tests, SM2.0 graphics tests, AI and physics driven single and multiple cores or processor CPU tests and a collection of comprehensive feature tests to reliably measure next generation gaming performance today.

3DMark06
Overall	Points	Ranking
2GB Kit Corsair DOMINATOR Twin2X2048-8888C4DF (200/800)	4472
4GB Kit Crucial PC2-6400 (200/800)	4458
4GB Kit Mushkin XP2-6400 (200/800)	4467
4GB Kit Mushkin XP2-6400 (200/1130)	4522
CPU	Points	Ranking
2GB Kit Corsair DOMINATOR Twin2X2048-8888C4DF (200/800)	2038
4GB Kit Crucial PC2-6400 (200/800)	2019
4GB Kit Mushkin XP2-6400 (200/800)	2042
4GB Kit Mushkin XP2-6400 (200/1130)	2186

Overclocking does not affect the overall score in 3DMark06 in Vista 64-bit, but the CPU portion of the benchmark gets a decent boost due to overclocking.