The 2 CPU GTLReF Voltage ratios are hidden and can only be accessed from the main menu using [CTRL] + [F1] from the main
bios menu screen.
The Options available are somewhat limited the only options being:-
CPU GTLREF1
CPU GTLREF2
Nowhere is the default given. reading around
Raja's The Gigabyte GA-X48T-DQ6 - Redefining the High End? - FSB Overvoltage Control
Quote:
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Unfortunately, we have no direct control over GTL (Gunning Transceiver Logic) reference values, which are locked at 67% of VTT for CPU die 1 and 63% of VTT for CPU die 2
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seems correct, & coincidently ties up with the Default value for the
GTL REF & VTT Voltage Settings - DFI X48 LT-UT. This togetherr with a bit of testing gives some logic to the settings:-
On this board running 45nm Wolfdale I have found that the best settings are 64%(-3%) & 60%(-3%)
Previous experience on the Abit with 65nm Quads I found 67% /66% worked best which here means Auto(67%) and Normal(63%) are the closest.