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This replacement CPU cooling fan is professionally designed for Dell Latitude E5440 E5540 series. Built with 5V 4PIN interface, it is an exact substitute for original fan 087XFX, MF60090V1-C620-S9A and MF60090V1-C480-S99. It provides steady strong airflow to quickly exhaust internal heat, solving abnormal fan noise, high temperature lag and automatic shutdown problems. Precise mounting design supports plug and play without modification, ideal for laptop daily maintenance and damaged fan replacement.