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high-quality slim laptop CPU cooling fan with part number EF50060S1-C180-S9A is a dedicated replacement for ASUS S551LB, V551LB, S551 and V551 series notebooks. It runs at DC5V with rated current 0.36A and features a 4-pin PWM interface. The motherboard can automatically adjust fan speed according to CPU temperature to balance cooling performance and acoustic noise. This thin centrifugal blower is custom engineered for the compact internal layout of these ASUS laptops. It quickly discharges heat generated by the CPU, solving high temperature, performance drops and random shutdown issues caused by worn or stuck original fan. Precision balanced fan wheel minimizes vibration and bearing noise for comfortable quiet operation. The mounting frame, screw holes and cable connector strictly follow OEM specifications. No cutting, drilling or modification is required during installation. Each fan passes strict rotational speed, noise and continuity testing before shipment to guarantee reliable cooling performance and long service life for your ASUS notebook.