I believe Ignatius is referring to the popular urban legend that the cooling systems of Macs are uncontrolled in Windows and rely solely on intel's inbuilt safety mechanisms. This only used to be the case where the bootcamp drivers weren't installed correctly but has somehow achieved the status of dogma on the internet.
I just boot into Mac, and turn up my fans a little before booting into Windows. However, if I push it harder (and Rift sometimes does) I'll hear my fans pick up a bit, even under Win 7.