It seems Gigabyte was gambling on users who wanted a GUI would rather use it in windows.
(Which is probably where we're headed for in the future anyway)
So they are pushing their Touch Bios software which despite the name can also be navigated with a mouse.
Rather than being just a tweaking utility like most software that comes with other boards, Touch BIOS is essentially your BIOS in Windows, and not just your BCLK / Multiplier / Core Voltage, but everything that's in the BIOS.
So if you want a bios GUI, you'll need to use Touch Bios software.
I havent personally used it or seen it besides screenshots since i dont own a newer Gigabyte board, but reading Gigabyte owners comments, they seem to think its great.