ATX_PWR1 on MSI B760M Mortar

ATX_PWR1 on MSI B760M Mortar | Generated by AI

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Question: What is ATX_PWR1 on MSI MAG B760M Mortar WiFi motherboard?

Answer:

ATX_PWR1 is the main 24-pin motherboard power connector from your PSU (power supply). It provides power to the motherboard itself. (MSI)

Physical appearance:

PSU 24-pin ATX cable
        |
        v

+----------------+
| ATX_PWR1       |
| [24 pins]      |
+----------------+

Motherboard

Your PSU will have a cable usually labeled:

ATX 24P
MB
MAIN

Plug that into ATX_PWR1.

It supplies:

+3.3V → chipset, memory logic, PCIe devices
+5V → USB, controllers, storage
+12V → motherboard power rails
standby power (5VSB) → allows motherboard wake features

The MSI MAG B760M Mortar WiFi has:

ATX_PWR1 = 24-pin motherboard power
CPU_PWR1 + CPU_PWR2 = 8-pin CPU EPS power connectors (MSI Download)

The layout is roughly:

Top of motherboard

[ CPU socket ]

[ CPU_PWR1 ][ CPU_PWR2 ]
      8-pin     8-pin

Middle:

[ PCIe GPU slot ]

Right edge:

[ ATX_PWR1 ]
[ 24-pin ]

For your build:

RTX 4070 / MI50 GPU → powered separately from PSU
CPU → CPU_PWR1 (and CPU_PWR2 if high power CPU)
Motherboard → ATX_PWR1

For normal CPUs like i5-12400 / i5-13600 / i7 at stock:

connect ATX_PWR1
connect CPU_PWR1
CPU_PWR2 is usually optional unless heavy load/high-end CPU. MSI designed this board with dual 8-pin CPU connectors for higher power CPUs. (MSI)

So basically:

PSU
 |
 +-- 24 pin ATX  ----------> ATX_PWR1
 |
 +-- 8 pin EPS CPU --------> CPU_PWR1
 |
 +-- another 8 pin EPS ----> CPU_PWR2 (optional)
 |
 +-- PCIe power -----------> GPU

For your MI50 AI workstation build, the important thing is: make sure your PSU has enough PCIe/EPS connectors and wattage. The ATX_PWR1 itself is standard and every ATX PSU has it.

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