I have the icx7250-48P running without approved fans!
This is the spoofer that worked for me (the other model I got either didn't work, or was a dud) and the vendor:
The other fan currently connected in the picture is this Noctua - it's running at 100% speed, but is barely louder than my CPU fan while in the same room
I didn't have to re-pin it, just make sure that when the chip is facing away from the white tab, the furthest left pin hole (ground) is sitting on the furthest left pin.
This is the spoofer that worked for me (the other model I got either didn't work, or was a dud) and the vendor:

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The other fan currently connected in the picture is this Noctua - it's running at 100% speed, but is barely louder than my CPU fan while in the same room

I didn't have to re-pin it, just make sure that when the chip is facing away from the white tab, the furthest left pin hole (ground) is sitting on the furthest left pin.
Code:
LAB-TABLE-04-7250#show chassis unit-id 1
The stack unit 1 chassis info:
Power supply 1 (AC - PoE) present, status ok
Power supply 2 not present
Power supply 3 not present
Fan 1 failed
Fan 2 failed
Fan 3 ok, speed (auto): 1<->[[2]]
Fan controlled temperature:
Rule 1/2 (MGMT THERMAL PLANE): 87.9 deg-C
Rule 2/2 (AIR OUTLET NEAR PSU): 49.0 deg-C
Fan speed switching temperature thresholds:
Rule 1/2 (MGMT THERMAL PLANE):
Speed 1: NM<-----> 95 deg-C
Speed 2: 85<----->105 deg-C (shutdown)
Rule 2/2 (AIR OUTLET NEAR PSU)***active***:
Speed 1: NM<-----> 41 deg-C
Speed 2: 34<----->105 deg-C (shutdown)
Fan 1 Air Flow Direction: Front to Back
Fan 2 Air Flow Direction: Front to Back
Fan 3 Air Flow Direction: Front to Back
Slot 1 Current Temperature: 87.9 deg-C (Sensor 1), 49.0 deg-C (Sensor 2)
Slot 2 Current Temperature: NA
Warning level.......: 100.0 deg-C
Shutdown level......: 105.0 deg-C
Boot Prom MAC : cc4e.24e6.6522
Management MAC: cc4e.24e6.6522