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This is a genuine Lenovo 03W5428 CPU heatsink and fan assembly, designed specifically for Lenovo ThinkStation C30, D30, S30 workstations/servers with LGA2011 socket. It supports up to 135W TDP processors, features a 4pin PWM fan for efficient cooling and quiet performance, and uses aluminum fins with copper base for fast heat dissipation. Plugandplay, no drivers needed, ideal for replacement or upgrade.