Memory not overclocking

I am not good in computer modification but i like to experiment now i am working on my CPU clock but when I am at top a bus speed of 240MHZ'll it start my pc creates problem voltage increase not helps too.that I read your memory is not far overclock and if I raise the bus speed of my cpu it increases the speed of automatic memory. can any one tell me what is the problem ? that memory speed too high or it may be something else.?

Specification
A770 Crosfire ASROCK mobo
Phenomenon AMD x4 9950 2.2GHz
Asus en9600GT MG
DDR2 1066MHz 2GB (Reaper)

Here I separate the memory with clock this is not automatic, but that is an Intel, I have no experience with AMD and even less with the on an AMD cpu clock

Maybe it helps if you reset the BIOS as:

- Power off PC
- CMOS button cell battery out
- Power switch 10 seconds content (still with the power off!)
- Battery replacement
- Power is back on


Perhaps there is a clock with "option is Enabled by default on Disabled State

Is there not an option where you can choose your memory speed? You have not provided a period sign (as stand-alone heard nothing to make). Perhaps it is that you sign the options are not supported.