That you would do gradually by proceeding with caution. The two ways of adjusting things on memory are in the system bios. The first is the timings setting as far as operating frequency. The second is the adjustment of the 2.6 volt setting for providing extra power when bringing up the timings. But there is soon a limit where the system will either lock or you could permanently damage the memory itself. If the system locks you would then have to clear the CMOS to return everything to the default settings seen when the main board was first installed.
