Spire KestrelKing I Socket 754/939/940 Cooling Fan to 4000+ Spire KestrelKing I Socket 754/939/940 Cooling Fan General Features: Sleevebearing 12VDC 3-pin connector 4200 RPM (+/- 10%) rated fan speed 3.6 W rated power consumption Quiet 31.8 dBA noise level 33.8 CFM rated air flow at 4200 RPM 0.24 A current draw Compatible processors: Athlon 64 ~ 4000+ (K8) Athlon 64 FX-51 (K8) Athlon 64 FX-53 (K8) Opteron ~ 2.6 (K8)