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This replacement CPU cooling fan is professionally engineered for Dell Latitude E5440 and E5540 series laptops. It adopts 5V 4PIN connector and fully complies with OEM standards, perfectly replacing 087XFX, MF60090V1-C620-S9A and KSB0505HB-DC10 original fans. Efficient airflow rapidly exhausts internal heat, effectively solving abnormal fan noise, high temperature overload and system lag problems. Precise mounting hole position supports plug-and-play installation without modification, ideal for laptop daily repair and faulty fan replacement.