MacBook Pro C2D Features New Improved Fans

Following our yesterday's news related to MB Pro comparison, Uli, one of our readers, has pointed out the new fans in C2D-based MB PRo

On the right, the new fan from the MacBook Pro Core 2 Duo features a modified impeller blade design as well as a different rotor. In the last MB Pro revision both fans spin, in silence, at 2000-rpm by default, while for the Core Duo-based MB Pro, the basal rotation speed was 1000-rpm (slower but noisier).
We have tested the ratio noise/rotation speed, and we start hearing them from 3000-rpm; but in all our tests they are much more silent than the previous models installed in MB Pro Core Duo.
Overall, the new MB Pro is more silent while being cooler.