24-pin ATX Power (PW1)

PW1 is the main power supply connector located along the edge of the board next to the DIMM slots. Make sure that the power supply cable and pins are properly aligned with the connector on the motherboard. Firmly plug the power supply cable into the connector and make sure it is secure.

PW1 connector

Plug power cable from system power supply to PW1

Figure 1. PW1 Motherboard Connector

Table 1. PW1 Pin Assignments

Connector

 

Pin

Signal

Pin

Signal

 

 

1

+3.3V

13

+3.3V

1

12

2

+3.3V

14

-12V

 

 

3

GND

15

GND

 

 

4

+5V

16

PS_ON

 

 

5

GND

17

GND

13

24

6

+5V

18

GND

7

GND

19

GND

 

 

 

 

8

PWROK

20

RSVD

 

 

9

+5V_AUX

21

+5V

 

 

10

+12V

22

+5V

 

 

11

+12V

23

+5V

 

 

12

+3.3V

24

GND

8-pin ATX 12V Power (PW12)

PW12, the 8-pin ATX 12V power connection, is used to provide power to the CPU. Align the pins to the connector and press firmly until seated.

Connecting Serial ATA Cables

The Serial ATA II connector is used to connect the Serial ATA II device to the motherboard. These connectors support the thin Serial ATA II cables for

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EVGA P55, 121-LF-E652 manual Connecting Serial ATA Cables, Pin ATX Power PW1, Pin ATX 12V Power PW12