ATX_PWR1 on MSI B760M MORTAR | Generated by AI
Question: What does the ATX_PWR1 connector mean on the MSI MAG B760M MORTAR WIFI motherboard?
Answer:
ATX_PWR1 is the main 24-pin ATX power connector on the board — the primary power feed from your PSU to the motherboard (chipset, RAM, I/O, PCIe slots, fans, etc.). It’s distinct from the CPU_PWR1/CPU_PWR2 connectors (the 8+8-pin EPS12V connectors near the CPU socket that feed the VRM/CPU directly).
On this board:
- CPU_PWR1~2 and ATX_PWR1 are the power connectors that allow you to connect an ATX power supply
- CPU_PWR1/2 are 8-pin each, carrying
+12VandGroundpins for CPU power - ATX_PWR1 is the 24-pin connector, with pin 1 being
+3.3V(ATX_PWR1 Pin 1 Signal Name 1 +3.3V) and the rest following the standard ATX24 pinout (+5V, +12V, PS_ON, PWR_OK, etc. — the manual only shows pins 1-2 in the excerpt I found, but it’s the standard 24-pin ATX spec)
Where it is physically: it’s located along the right edge of the board near the DIMM slots — in the component overview it sits near JUSB3, JUSB4, and PUMP_FAN1, adjacent to the 24-pin edge connector you’d expect.
Practically for your build: plug your PSU’s 24-pin cable into ATX_PWR1, and the 8-pin (or dual 8-pin if you have a higher-end CPU) EPS cable into CPU_PWR1 (+CPU_PWR2 if populated). If you’re flashing BIOS via the Flash BIOS Button before installing CPU/RAM, MSI’s instructions confirm you only need the power supply connected to CPU_PWR1 and ATX_PWR1 — no CPU or memory required for that step, which is handy if you want to update BIOS before finishing the build (e.g., to make sure a newer CPU is supported day one).
References:
- MSI MAG B760M MORTAR WIFI II User Guide (PDF)
- MSI MAG B760M MORTAR WIFI II Manual (manua.ls)
- MSI MAG B760M MORTAR WIFI Product Page