Power Rails (S/E)

For Original Xbox 360, see Power Rails (Original).

The Xbox 360 S and Xbox 360 E motherboards have various rails which power components of the system.

Standby Power

V_1P2STBY

• Voltage: 1.2V
• Source: V_5P0STBY
• Not present on Trinity

V_1P8STBY

• Voltage: 1.8V
• Source: V_5P0STBY
• Only present on Trinity

V_3P3STBY

• Voltage: 3.3V
• Source: V_5P0STBY

V_5P0STBY

• Voltage: 5V
• Source: Power Supply

Main Power

V_12P0

• Voltage: 12V
• Source: Power Supply
• Multipurpose System Power

V_1P2

• Voltage: 1.2V
• Source: V_3P3
• Multipurpose System Power
• Not present on Trinity

V_1P8

• Voltage: 1.8V
• Source: V_5P0 (Trinity), Tied to V_CPUPLL (Corona, Waitsburg, Stingray, and Winchester)
• Multipurpose System Power

V_3P3

• Voltage: 3.3V
• Source: V_12P0
• Multipurpose System Power

V_5P0

• Voltage: 5V
• Source: V_12P0
• Multipurpose System Power

V_5P0DUAL

• Voltage: 5V
• Source: V_5P0 or V_5P0STBY, controlled by SMC
• Purpose: USB Port Power

V_CPUCORE

• Voltage: 0.9-1.2V, controlled by CPU via APS
• Source: V_12P0
• Purpose: CGPU Power

V_CPUEDRAM

• Voltage: 1.075V
• Source: V_12P0
• Purpose: eDRAM Power

V_CPUPLL

• Voltage: 1.83V
• Source: V_3P3
• Purpose: CGPU PLL Power

V_CPUVCS

• Voltage: 1.25-1.3V, controlled by CPU via APS (CPU VID * 1.4)
• Source: V_5P0
• Purpose: CGPU VCS Power

V_EFUSE

• Voltage: 1.5V
• Source: V_5P0
• Purpose: CGPU eFUSE Power

V_GPUPCIE

• Voltage: 1.5V
• Source: V_3P3
• Purpose: CGPU PCIe Power

V_MEM

• Voltage: 1.8V
• Source: V_12P0
• Purpose: RAM Power

V_SBPCIE

• Voltage: 1.83V
• Source: Tied to V_CPUPLL
• Purpose: Southbridge PCIe Power
• Only present on Trinity