Madshrimps posted an extensive AMD and Intel Heatsink Roundup. Which one will keep your CPU the coolest, how quiet can it get?

The first quiet heatsink is again the Zalman which makes an impressive showing; the TTIC NPH Big is able to perform on par/slightly better than the Ninja, quite an accomplishment. Its stock fan is rather noisy at high speed, but becomes very quiet at low speeds.

The Intel Stock cooling has a temperature regulated fan, trying to keep the CPU temperature below 60°C at all times, when we left the machine running for several HOURS at full load the fan was spinning close to 4300rpm and at 66.8dBA it's ear deafening. If we only loaded the system for half an hour the fan would reach ~2500rpm this gave a more acceptable 50dBA noise level, on par with some of the other heatsinks tested.

The Coolermaster Eclipse disappointed at high speed but was able to claim a super low noise level at lower speed, surprisingly the temperature only climbed by ~3°C, while the noise drop was close to 20dBA! The Mars had trouble keeping up at low speed but the system did not crash, no temperature throttling was happening either, at this speed the HSF was inaudible.