Now we are down to the BIOS of the GIGABYTE 690G motherboard. Award 6 Modular BIOS is GIGABYTE's choice for BIOS these days. AMI has been used by GIGABYTE in the past but that is ancient history now. Normally GIGABYTE puts its overclocking options under the Motherboard Intelligent Tweaker (M.I.T) menu, but this motherboard has its very limited overclocking options under the Advanced Chipset features.
GIGABYTE only has one major overclocking option, that being the CPU host clock. This can be changed from 200MHz to 400MHz in 1MHz increments. Without any memory voltages, CPU voltages or chipset voltages, we only got to 205MHz.
Clearly you will not be doing any serious OC with this motherboard.