Most probably I think there would be an option in bios to change some memory settings however I would not recommend you to change these settings. Changing these settings may make the motherboard useless if they are wrongly configured and the board may never boot up again.
If your system is running fine I would suggest you leave it as it is. Else you could go for compatible memory modules that have officially been tested on this board. Link for tested memory: http://support.intel.com/support/motherboards/desktop/dg45id/sb/CS-029147.htm