"The Rx6C register is 8-bits wide and therefore can handle up to eight SDRAM settings. Of course, the number and nature of the SDRAM settings controlled by this register vary from chipset to chipset.
This BIOS feature only functions as a switch that determines if the BIOS is allowed to overwrite the default settings of the SDRAM Control register. A separate BIOS feature called OverWrite Rx6C is used to..."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips