FYI the max voltage Intel uses under thermally controlled conditions (think a massive waterblock with 3 loops running through it) is 1.6V. So as long as you stay under that and keep your temps in check then it shouldn't degrade the part too much.
That's not true at all. Intel has never specified a max. Where did you get this from (not being antagonistic, I actually am curious where did you get this from).
Max voltage, based on people's experiences, are around 1.5v-1.6v but unlike Sandy Bridge, I haven't heard anyone say anything has happened even in those voltages. Ivy is quite hardy.
I want my chip to last so I like to keep it under 1.35 and 80c I can get to 5ghz at 1.5 but like to run 24/7 at 1.280v @4.7ghz
What do you mean? Is there any indication that over even 1.5v and 90*C would hurt the chip or make it not last? I think we got a chip there that you're talking 15+ years lifespan, so degradation is more like 20 years to 18 years. I mean these are all imaginary numbers but I haven't heard anything of ivy degrading.