how accurate are the temps on nf7-s?

im kinda scared to push more volts to my mobile +2500. i can get to 2800mhz at ~1.96 volts and idle is 40-41c and load is ~48-52c. this is watercooled with dtek rad, rbx waterblock and eheim 1250 pump. im just curious if these are accurate or as ive heard a few times they may be reporting high. does anyone have a probe setup that can verify this?

Hrrm..I thought it was the cpu core voltage nf7-s reports higher than what it actually is.

actually core voltage is lower than what it is in bios , if i have it at 1.95v in bios i get aprox 1.87v.