CPUs are only guaranteed to run at the speed that they are rated at
Many will run faster but the chances of instability increase the farther above the native speed you go. A motherboard may support a 2800 Mhz memory IO bus but the CPU that has to do all the work will probably choke horribly without significant fine tuning if it will even run at all. It's mostly a marketing thing
I recommend CORSAIR Vengeance 99% of the time, quality RAM and low profile with XMP profile. And if u will get an aftermarket CPU cooler, low profile is the worry free remedy with perfect fit with any large cooler.
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Vengeance Low Profile heat spreaders have a reduced height of 1.03" (26.25mm). They're designed for high-performance systems with extra-large CPU coolers, small form factor system builds, or any other space-constrained application where standard Vengeance memory might not fit.