I tried Zucker2k settings on my board and looks like i manage to lower the VTT voltage from 1,38 V to 1,28 V on 450 fsb. For NB any step lower than 1,55 V for 450 fsb its ending with BSOD or freeze. Looks like im not too lucky with my NB but at least the temp will be much better after i put a Thermalright HR-05 SLI / IFX on NB. Right now with 1,55 V on NB i have 48c idle and maxim 60c load with OCCT or Prime blend running for more than 1 hour.