Quote: Originally Posted by aquitas
The question was really can i run 2x2 with 2x4, if so i just have to make sure there is a specific single speed in each channel right?
Generally you need to use the same capacity DIMM in the paired slots. (I believe that some AMD boards don't require that, but it'd be optimal anyway.)
The RAM will all run at the same settings, which makes mixing types a little dubious. The SPD (serial presence detect) chip on one type may cause the board to choose settings that don't work with the other. You may be able to get around that with manual settings, but I wouldn't count on being able to mix types.
As regards overclocking, with the k suffix (unlocked) chips, it's very easy. With a good motherboard, changing the multiplier is all that needs to be done; the board will do the rest. The stock cooler may not be up to the job, though.