Below pic is what is apparently hidden in GB bios, this pic from another poster is bios of intel x58 board. I think this explains why F3 bios is stable with turbo enabled with a lower Vcore than all F4beta bioses.
F3 bios apparently sets 1-core and 2-core ratio limit of 21 for i920 and 23 for i940, ie allows turbo for 1 and 2 cores loads. While 3 and 4 core ratio limits are stock or 20 i920 and 22 i940. All F4betas have 1-4 core ratio limit all set at turbo mode 21 for i920 and 23 for i940. For that reason to be stable in F4 beta bioses, you have to turn turbo off or use significantly more vcore than what you need for stable in F3. It may also be necessary to adjust TDP override as well.
I wonder if enough of us email GB, would they make this option accessible to us.
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