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Laptop CPU cooling fan compatibility fits notebooks using 4 pin PWM CPU fan headers and similar mounting points; compatible with multiple 4 pin laptop models; check connector shape and screw holes before purchase. LD7509S5 OEM number identifies this replacement; match your original part by LD7509S5; 4 wire connector supports PWM control for precise speed matching to system requirements. DC 5V 0.14A 4 pin PWM performance delivers airflow to move heat from the CPU and heatsink; responsive speed control aids temperature balance; compact housing suited to tight laptop bays without external logo. Notebook CPU cooler replacement use stabilizes CPU frequency during gaming, editing, or coding; helps maintain consistent performance and lower noise in home, office, classroom, or travel setups. Laptop repair application scenarios include home maintenance, office IT support, and workshop refurbishing; verify screw layout and cable orientation; professional installation recommended for fit and function.