its 4.9 x 4.9 x 2.5 Inches or 125 x 125 x 63.5 mm
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006 (sorry I don't know how to make it link) - Will this fan work on my computer?
My current power supply info is below.
Key Features AC Input 115V - 230V Warranty 1 Year Form Factor Micro ATX Weight 2.5 lbs Output Power 270 W MTBF 100,000 HOURS @ 25C Ambient Dimensions WxDxH 125 x 125.0 x 63.5 mm Fan Features Quiet 60mm Sleeve Bearing Fan Connectors Main 20.pin, P4 4.pin, 3xMolex 4.pin, 1xFDD 4.pin Detail Specifications FEATURES : -- MAIN 20.PIN FOR LATEST INTEL OR AMD -- STANDARD MICRO ATX FORM FACTOR -- QUIET 60mm SLEEVE.BEARING FAN -- ULTRA.HIGH EFFICIENCY -- ENERGY SAVER | 1.WATT STANDBY MODE -- HONEYCOMB REAR VENTILATION DESIGN -- ADVANCED THERMAL CONTROL SENSOR -- REPLACE | UPGRADE TO MOST MICRO ATX -- ON/OFF SWITCH SAFETY: -- UL, CSA, VDE, NEMKO, TUV, CE, CB, FCC SPECIFICATIONS : -- EFFICIENCY: 75%+ -- LOW RIPPLE | LOW OPERATING NOISE -- OPERATING TEMPERATURE: 0 TO +50C -- STORAGE TEMPERATURE: -20 TO +65C -- HUMIDITY: 10-90% NON.CONDENSING -- OVP: OVER VOLTAGE OUTPUT PROTECTION -- OCP: OVER CURRENT OUTPUT PROTECTION -- SCP: SHORT CIRCUIT OUTPUT PROTECTION -- 100% HI.POT TESTED -- MTBF: 100,000 HOURS @ 25C AMBIENT OUTPUT.CONNECTORS: -- MAIN 20.PIN, P4 4.PIN, (3) MOLEX 4.PIN, (1) FDD 4.PIN INPUT : -- 115V INPUT U.S. | 230V WORLDWIDE -- PATENTED INPUT FUSE PROTECTION BUILT-IN DIMENSIONS | WEIGHT : -- DIMENSIONS: 125.0Lx125.0Wx63.5H (mm) | WEIGHT : 2.5 LBS -- SHIPPING: 16 UNITS/CARTON | WEIGHT : 42 LBS/CARTON OUTPUT CHART: -- Output Voltage: +3.3V, Min. load: 0.5A, Max. load: 6.0/16.7A , Load Reg: ±5%, Ripple & Noise: 50mV P-P -- Output Voltage: +5V, Min. load: 1.0A, Max. load: 25/18.0A , Load Reg: ±5%, Ripple & Noise: 50mV P-P -- Output Voltage: +12V, Min. load: 1.0A, Max. load: 16.0A , Load Reg: ±5%, Ripple & Noise: 120mV P-P -- Output Voltage: -12V, Min. load: 0.0A, Max. load: 0.6A , Load Reg: ±10%, Ripple & Noise: 120mV P-P -- Output Voltage: +5Vsb, Min. load: 0.1A, Max. load: 2.0A, Load Reg: ±5%, Ripple & Noise: 50mV P-P Warranty -- 1 Year