Your overclock is less dependent on your RAM with i5 compared to socket 775. Especially if you're not throwing on a mass of sticks. 1600mhz ram should do just fine, if you can't get it stable at 1600mhz (should be able to do that on a 200mhz base clock which'd mean you'd be running your i5 at 4ghz) then I'm sure it'll do 1200mhz. And I doubt you'll notice the difference.
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