M2 Pro MM runs a lot hotter than the M1. The fans are still low, and I can't hear them over the ambient noise, but temp are higher and the physical case is hotter as well.
While playing WoW, the M1 GPU stays in around the 60C, but the M2 Pro was getting close to 150C. This is with the fans at idle on both Macs.
Sorry all, I screwed up when reporting temps.A guess a downside is that I also tripled the temps.
I couldn't believe how high the temps were reaching in the M2 Pro MM, especially with the fan staying at idle. It is because the temps on the M2 Pro MM's iStat Menu app was in Fahrenheit. I guess it is the now the default in iStat Menu. Either that, or I changed the settings on the M1 MM's iStat Menu to Celsius at some point and forgot that I changed it.
The actual differences in temps are not as big, but still a difference. The M2 Pro is a little bit hotter. I will do an actual comparison and report.