Sorry for bumping such an old thread but I just had to comment. I never understand how so many review sites out there seem to get things wrong. I bought one of these coolers and it dropped my 570 on load from 83 degrees to 47 degrees on lowest fan speed. 44 @ medium fan and 40 @ high fan.
You're also not the only reviewer who got a bit confused with the low/medium/high settings of the cooler. I noticed right away that after 50 percent the rpm does not increase, however there is still 3 clear low/medium/high settings with the fanmate. You tested low/high/high in your review. I'm not sure why your results are so far off from mine though, maybe it was not mounted properly.