Swiftech MCP35X Pump for PC Liquid Cooling Systems Small Footprint: 2.4" x 2.4" x 1.36"; 50,000 hours MTBF (Mean Time Between Failure) ; 12 Volts DC convenience: plugs into the computer power supply Variable speed control via PWM thru the motherboard, from 1300 rpm for completely silent operation, to 4500 rpm for ultra high flow performance; Superior head pressure and flow rate (in the useable range) to any pump in its footprint: the MCP35X is particularly well adapted to support multiple devices in the same loop, such as multiple radiators, and/or waterblocks;