Dell M1000e Fan Revisions

Hi,

What is the DP/N of the currently shipping fan module for the Dell M1000e? Can anyone tell me the difference between DP/N: X46YM, XR458, and Y212R?

These use the Nidec dual rotor fans and have the same MFG part number, but the amperage is different.

XR458: MFG# 72160, R80J12BS1MC-07A02, 5.6 Amp

Y212R: MFG# 72160, R80J12BS1MC-07A02, 5.6 Amp

X46YM: MFG# 72160, R80J12BS1NC-07A02, 5.0 Amp