Understanding MCIO Cables in Supermicro MI300X Systems
MCIO (Multi-lane Cable I/O) connectorsare used forhigh-speed data transmission between the motherboard and NVMe SSDs or PCIe devices.
These connectorsmust be handled carefully, as improper removal cancause pin damageorpermanent failure of the interface.
How to Properly Unlock and Release MCIO Cables
Locate the release levers on the MCIO connectors
Each MCIO connector has asmall built-in release leverthat locks it in place.
Press down on the release levers
This disengages the locking mechanism andallows the cable to slide out easily.
Gently pull the MCIO cable straight out
Do not pull at an angleas it can damage thehigh-density connector pins.
Why Other Options Are Incorrect?
A (Pull really hard)→ Forcing the connector without releasing the latch canbreak the MCIO pins or damage the motherboard socket.
B (Remove screws)→ MCIO cablesdo not use screws; they have built-in locking mechanisms.
D (Loosen bolts)→ There areno boltssecuring MCIO cables; only therelease lever is needed for unlocking.
Official Documentation Reference:
Supermicro AS-8125GS-TNMR2 Motherboard Manualstates thatpressing down on the release levers is the correct method to unlock MCIO cables.
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