Is it better to use 2x 2GB or 1x 4GB RAM with a i7 2600k Sandy Bridge performance-wise for:
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So it's a dual channel architecture and you should get better performance with two RAM modules.
2x2GB will provide better performance in all applications because it will allow you to place an equal amount of RAM on each channel of the memory controller. However, 1x4GB will leave more slots available for future expansion.