Seems quite cheap for a well-known brand. Don't forget 3% Quidco. I have just fitted this PSU to my PC and am very pleased with it. It is not at all noisy.
GX-Lite power supply is the light version from the original GX series, it specifically targeted at systems in the mid to high range, yet reasonably priced, providing users with unsurpassed cost per performance. Features single highly 12 V rail, proficiently delivering power all the way up to 86%-88%, also supports most demanding components including the processor, drives and cooling fans. The GX-Lite Series will keep the power in your hands. Tackling challenges from the most power-intensive peripherals head on, this solitary 12 V power rail provides ample power and strong resistance to any overloading. Dual protection from electromagnetic interference, thus restraining noise and interference for greater protection for you and your connections. 120 mm silent fan with built-in fan control provides first class airflow and low noise level. Integrating this active controller will increase the efficiency of any computer, making PFC higher than 99%. Over Voltage Protection (OVP), Over Power Protection (OPP), Short Circuit Protection (SCP) offers maximum safety to your system.