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#1
VID vs. VCORE
What is the difference
And what's the max for haswell
VCORE is the manual or offset voltage you are sending to your CPU. You can manipulate and adjust this number.
VID is a number that can't be changed, and is sort of a "default" voltage for stock settings. Think of it like this....when you are running an "offset" voltage, you are running at or around the VID +/- whatever offset you plug in.
As for the max voltages for Haswell......I have no clue. You can check on Intel's website for their specs, but that is more of a rough estimation as every chip is different.