IS7 vcore voltage weirdness

Just wondering if anyone else has seen this. I have just moved to New Zealand and have a 480 ANTEC True power supplies in both my IS7/IS7e machines. Now with the votalge set to 230 I get some strange behavior on the CPU core.

If I set the vcore to 1.6, 1.65, or 1.7 I don't fluxuate that much from it maybe +/- .02.

Now if I set it to 1.625, 1.675, or 1.725 I fluxuate as much as +/-.09 on the CPU core voltage. Its like all over the map.

Now I don't recall having this issue when I was in the States but I may have. Anyone else seeing this behavior with the IS7s?

Any one have this happen? Would modding the PSU help?

I have the same problem with an Abit IS7-E on 220V. Vcore fluctuates like you wouldn't believe, also, between .07 and .1v. I though it was the PSU but switching PSUs didn't help