Benchmark: 2x2GB vs 4x2GB 1066Mhz DDR2 RAM

My friend and i first thought of increasing of memory capacity might resulted in lower performance, so i decided to do benchmark comparison on old pair against old pair plus my newly bought pair of Kingston HyperX 1066Mhz DDR2 RAM module which means 2x2GB vs 4x2GB configurations. Four of them are exactly same performance, but the new pair just come with extended heatsink. The OS platform using for benchmark is Windows 7 64-bit RC build 7100 and hardware configurations of my system shown in CPU-Z at below:

System configuration showing in CPU-Z.

I have used Everest v4.60 beta and SiSoftware Sandra 2009 SP4 to benchmark and compare the configurations performance differences.

EVEREST Benchmark
The yellow bar is 4x2GB setup and the green bar is 2x2GB setup.

Memory Read Benchmark

Memory Write Benchmark

Memory Copy Benchmark

Memory Latency Benchmark

SiSoftware Sandra Benchmark
The red and orange bars are 4x2GB configuration and the rest 3 are 2x2GB configuration.

Memory Bandwidth Benchmark

Memory Latency - Random Access Benchmark

Memory Latency - Linear Access Benchmark

Cache and Memory Benchmark

Conclusion
Memory Read, Write and Copy having slight bandwidth increase instead of dropping, and the latency is having no different. After all, the memory capacity did not dropping the memory performance as we expected.