The full range is between 1.2000v and 1.3250v. If you see anything below 1.200v that's because the EIST/C1E features are enabled. CoreTemp ignores these features and always reports the correct VID.
Someone at Anandtech made a poll of Q6600 VIDs and came up with this histogram. The original discussion thread is here. Note that the poll has stopped collecting data since 9/23/2007.




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