Another quality, new power supply from FSP targeting the small form factor audience. These new SFX power supplies are designed with small system builds in mind – for incorporation into a Micro ATX or Mini ATX chassis. FSP have designed these units able to deliver most of their power across the +12V single rail. Both 550W and 650W models incorporate a 92mm ball bearing fan and they call it a ‘Semi Fanless design’ meaning the fan will only spin up when the load rises.