I am building a system with Gigabyte MB model GA-P55A-UD7 which "Support for DDR3 2600+/2200/1600/1333/1066/800 MHz memory modules".
The CPU will be Intel i7-860 which support memory speed of "DDR3-1066/1333".
Is there any benefit to use memory with higher speed then what the CPU supports (1600 and above)?
The i7 860 should be paired with DDR3-1333 at a minimum, since it can support that speed of RAM at stock speeds. Using faster RAM like DDR3-1600 can provide better performance when overclocking.