VID is the voltage identification register, which tells the motherboard what the voltage it is supposed to set for that chip. Every individual chip has a different VID. So in a way, Vid "IS" Vcore in a way. One Q9650 might have a 1.15 vid while another has a 1.3 vid. This is just what the motherboard should give the cpu at auto vcore, if the bios works correctly.
Max vid is basically saying what the max possible vid can be for that particular chip range. And I think "manual" vcore settings override that.
But you're pretty much able to raise voltage up to the highest vid range for the processor line without risking any damage.




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