Asus PRIME TRX40-PRO Manual page 28

3. 8-pin Power Plug LED
The 8-pin Power Plug LED lights up to indicate that the 8-pin power plug is not
connected.
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1-12
Ensure to connect both 8-pin power plugs.
Due to the CPU minimum power consumption requirement, we recommend using a
PSU with 850W or above.
Chapter 1: Product Introduction