GeforceMasterRace :
Hawkshot :
well if you tell us what CPU and motherboard you're getting we can help.
CPU: i7-2600
Mobo: Gigabyte GA-B75M-D3H
Well, in order to get a 1600 MHz RAM speed, you'd have to install an Intel 22nm (Ivy Bridge).
Also, depending on your operating system, you can get (or not) more or less RAM. If you have a 32-bit windows operating system, you can only get up to 4GB RAM, if you have a 64-bit operating system, you can get as much RAM as your motherboard allows you. Respecting the specifications on both your CPU and MOBO, I'd recommend these: Kingston DDR3 4096MB 1333Mhz