TLDR: If I plug in 3 Noctua industrial fans for PWM, none will spin up. If I plug in any two of them (or 2 + a rando fan), all will will work fine.
I recently got a (new to me) X9DRi-LN4F+ SuperMicro motherboard inside SC846E16 4U chassis.
After researching the best way to quiet it, I replaced the stock fan wall with 3x 120mm Noctua NF-F12 iPPC-3000 fans. I tested one out, and it worked fine. I then built the new fan wall, plugged everything in, and... nothing.
This is what I've tried:
Other things to note:
Any ideas?
I recently got a (new to me) X9DRi-LN4F+ SuperMicro motherboard inside SC846E16 4U chassis.
After researching the best way to quiet it, I replaced the stock fan wall with 3x 120mm Noctua NF-F12 iPPC-3000 fans. I tested one out, and it worked fine. I then built the new fan wall, plugged everything in, and... nothing.
This is what I've tried:
- If any 2 of the fans are connected to the motherboard (in any of FAN A/B or 1-4 headers), they'll spin up fine (nice and quiet)
- If I connect a 3rd fan to the backplane (which doesn't provide PWM) or use a 4->3 pin adapter cable connected to a header pin on the motherboard, the third fan will spin up at full speed
- If I connect all 3 directly to mobo headers, none of them will spin up – they get a tiny jolt of movement when power goes on, but that's it.
- If I plug in 2 of the Noctuas and a random 120mm Arctic F12 PWM fan I had lying around, all three will spin up and work fine.
Other things to note:
- I've reset IPMI to factory defaults
- I replaced the 2 rear fans with 80mm Noctua NF-A8 PWMs connected to FAN5/6 and they PWM fine.
- This problem persists under all fan profiles
- I've adjusted the IPMI thresholds for all the Noctuas to be in line with their published speed ranges
Any ideas?