My ram is Kingston, of their bugdet line. I originally bought OCZ Platinum PC6400, but it was not compatible with my motherboard. This was a frustrating problem, because it was not compatible because it required a minimum voltage of 2.1V, but my board had a max output of 1.9V. The only RAM of equal capacity in the same price range that drew no more than 1.9V was Kingston PC5300.
My motherboard lets me change the CPU multiplier, bus frequency, and VCore. I think it may have an option for memory overclocking, but I'm not sure.