need some new ram

You could just buy another stick for £20: corsair xms3 4gb (1x4gb) ddr3 pc3-10666c9 1333mhz single-channel module

two sticks = dual channel if put in the correct slots on the motherboard (usually two of the same colour).

there isn't a massive difference in performance between 1333mhz and 1600mhz though there is some benefit in some things if you don't mind paying the extra.

sandy bridge memory scaling choosing the best ddr3

DDR3 SDRAM for Sandy Bridge: Choosing the Best Memory for LGA1155 Platform

The Best Memory for Sandy Bridge
 
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