TL;DR: set VCCPLL_OC to 1.2V for accurate temp readings. More VCCPLL_OC is also safe(upto 1.35V). Less than 1.2 is potentially dangerous because your CPU's thermal protection won't kick in properly.
AHOC Patreon/Shirts/Paypal/Junkyard:http://cxzoid.blogspot.co.uk/p/suppor...
The Twitch: / buildzoid
The blog: http://cxzoid.blogspot.co.uk/
The Facebook: / actuallyhardcoreoverclocking