you can adjust the fan speed in the BIOS. This begins at IDLE to law nervigem totals and increases up to the hair dryer-sound. Idle comes back ice-cold air out with a strong air flow. A besserere control plus quieter fan would this not exactly cheap equipment are good. So a small part is usually also available on the desk, where it is particularly good to hear.
Alternatively there is the similar Q520 by Fujitsu. Differences are here: integrated power supply, a bit bigger, DVD drive available, fans can be switched off - then it will be very hot, with fan but then at least less annoying than the HP model.
I think in the future, a lot will do in the Mini PC market, but not yet fully mature, these seem to be mini PCs. IDLE with 5 watts consumption must be possible fanless operation without restriction. Apple makes it before but with the Mac mini.
