At both the 2000 and 1500 RPM settings, we were able to achieve acceptable performance far superior to OEM cooling. This also applies to fan noise which will be of interest to you HTPC builders out there. Another nice point is that with the Volar's elevated and angled fan, we get the added benefit of circulating air over part of the motherboard and it's likewise warm components. That little extra bit of cooling on motherboard components can make all the difference in the world to system stability as we all know.
FULL STORY @ OVERCLOCKERCAFE (http://www.overclockercafe.com/Reviews/cooling/Gigabyte_Volar/index.html)