Quote Originally Posted by @lex View Post
I wonder how much those VRM temperatures you've measured with that probe correlate with the real tempeature of MOSFETs. If I were to make such a test of waterblocks I would get a pyrometer with laser pointer and measure the temperature on the back of PCB right under one of MOSFETs. It is also possible to measure the temperature of memory chips. Such a measure would strictly correlate with the real temperature of the component on the face side of PCB.
This test was not designed to find the exact VRM temperatures, but to find the difference between blocks. That's why it's not required to have them precise, but as close as possible. The difference should stay the same when you're in the same area as the VRM.