Load on Prime 95. Disabling LLC may cause a ~0.06v vdroop for my x4 955.
Changing to 1055T and the same board, LLC overvolt goes higher. Set 1.4125v for 4GHz and shows 1.452-1.464v on CPU-Z under Prime 95 load. Similarly as yours.
I'm struggling if CPU-Z voltage value is a bit higher than actual on M4A89TD? I have measured vcore use a voltmeter on C4F, and it is always ~0.02v lower than what CPU-Z showed (1.4125v 4GHz setted in BIOS as M4A89TD, 1.438-1.440v measured, 1.452-1.464v on CPU-Z under Prime 95 load), I doubt this because I'm not sure if C4F's LLC level is the same as M4A89TD.

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