I have motherboard ASrock H470 with both 24 pins and 8 pins slots for power. I have power unit which has both 24 pin and 8 pins cables.

Do I have to connect both cables?

  • 2
    Your motherboard manual should tell you want you need to do.
    – Mokubai
    Commented Nov 14, 2020 at 18:54
  • Yes, you do need to connect both cables. Commented Nov 14, 2020 at 19:21
  • The manual says nothing, it just says therer are three power slots 4,8,24 pin Commented Nov 14, 2020 at 23:14
  • Who is speaking the truth, you (8 & 24) or the manual (4, 8 & 24) ? Commented Nov 15, 2020 at 3:58
  • Ah ok guys thanks So I plugged 8pin power cable and was able to start Commented Nov 15, 2020 at 8:53

2 Answers 2


As you can read on pages 24 and 25 of the manual, all 3 power connectors need to be plugged in (they do say "please").


You should connect both.

The 4-pin/8-pin connector powers the CPU as it is quite power hungry, and the 24-pin connector powers the rest of the motherboard. Without either of these you won't get a functional ATX box.

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