Suztera is right, I downloaded Techpowerup and there are no VRM temps in there either. I have a Galax GTX 970 with single fan. It's very cheap compared to other GTX 970s.
The issue now is that I want to put an Arctic Accelero Xtreme IV on there (http://www.arctic.ac/eu_en/accelero-xtreme-iv.html) but then I won't have a clue whether my VRM is cooled enough.