The compact gaming PC is possibly the most difficult category of PC to keep quiet. While it's possible to build a tiny PC without fans or moving components, combining small size with competitive performance is next to impossible – especially when that performance is being poured into the graphics engine of a PC
This system is powered by an Intel Core i5-4670K, overclocked from 3.4 GHz to 3.8 GHz, which is hardly an overclock at all considering this is the rated Turbo speed of the processor. But this approach does avoid increasing the cooling requirements to the extent that noisy, high-speed fans would be required. Quiet PC has chosen the Noctua L9i cooler for the CPU, which is specially designed to cause minimal audible noise, if not designed for extreme overclocking. We would advise against purchasing this system and pushing the CPU frequency higher unless you really know what you're doing.
The PC also uses a quiet 750W FSP Aurum Modular power supply. This may seem vastly over-specified considering the maximum power draw of the PC, which we measured at 330W, but keeping the power supply at under 50% maximum load enables it to run much more quietly than one which is straining near its full capacity.