Cooler Master E1U-NPESC-30 (E1U-NPESC-03) 1U Passive 478 Socket HeatsinkApplication System: 1U Form Factor Passive Solution (90 degree Air Orientation)CPU Type: Intel P4 CPU up to 3.4GHz FSB 400/533/800 MHzSocket Type: 478 pinsHeat Sink: Copper Skived FinCooler Dimension: 83x 68x 25 mmFastener: ClipInterface Material : Shin Etsu X-23-7762