for Genuine Dell original OEM Left-side cooling fan, compatible with the Dell XPS 15 (9570 and 7590) and Precision 5540 laptops. This fan is cools the CPU Processor side of the heatsink.

for Dell laptops/notebooks,XPS 15 (9570)/ (7590)/Precision 5540

P/N: F01PX, 0F01PX

DC 5V - 0.5A
4.46CFM

Alternate P/N: 
DC28000NID0

Note: This is the LEFT-Side CPU Processor cooling fan.