What is the difference between NIDEC & Delta Fans?
NIDEC and Delta (NMB) are different fan manufactures. NIDEC Fans have 17 blades while the Delta Fans have 23 blades. Delta fans are considered to be quieter and more efficient than NIDEC fans. NIDEC fan will have a humming/low-frequency noise. Also note that the PS5 reportedly also has a problem of current noise and excessive sound of the optical drive. Replacing the fan can only solve the low-frequency noise caused by the fan.
PlayStation 5 Disc Edition
PlayStation 5 Digital Edition