ASUS P8Z68 reduces the clocks on the Memory and CPU. When a high load program is run, it then takes the clocks up to the required setting i.e 4.2Ghz and 1600.. But only my CPU is switching. However in any other game i.e ARMA 2 or BF3 the Memory jumps to 1600 but not in the Arma 3 Alpha.