The VID that people keep referring to (1.52) has NOTHING to do with the maximum safe voltage. Nothing.
All that it is is an indication of what the maximum possible VID is for a chip.
It starts at .25 (or something like that) and increments its way up to 1.52.
That does not mean that there will ever be a chip that can run safely at 1.52 or .25 based on this info.
As to the maximum safe voltage? No one knows. But VID has nothing to do with it.