actually, i read on several places that the options above 1.45 dont work. they are same as 1.45 or somesuch.
vcore increase doesn't generally help much with overclocking on the winchesters though, so i wouldn't worry.
also if that's in a SFF case, you quite likely don't want any more than 1.45v adding heat in that thing.
how's its performance btw? i'm thinking of getting one for my father...