Can I connect M.2 (M-key) to Molex 4-pin?

M.2 (M-key) and Molex 4-pin are not directly compatible.

Do I need an adapter for M.2 (M-key) to Molex 4-pin?

No, M.2 (M-key) and Molex 4-pin can be connected directly without an adapter.

Will connecting M.2 (M-key) to Molex 4-pin cause signal loss?

No significant signal degradation is expected when connecting M.2 (M-key) to Molex 4-pin.

M.2 (M-key) ↔ Molex 4-pin

Compatibility check and signal path analysis

Adapter Required

These connectors are not directly compatible. An adapter or converter cable is needed.

Signal Path

M.2 (M-key) Unknown

Molex 4-pin Power

M.2 (M-key)

Family Storage

Form Factor Card-edge socket

Pin Count 67

Reversible No

Molex 4-pin

Family Power

Form Factor Rectangular nylon 4-pin

Pin Count 4

Reversible No

Notes

M.2 (M-key) to Molex 4-pin: Storage and power connectors serve different purposes, though some storage connectors (SATA) include power delivery pins. The M.2 (M-key) (Storage) and Molex 4-pin (Power) are from different connector families.