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.

Main Power

V_12P0

• Voltage: 12V
• Source: Power Supply
• Purpose: Full-On System Power, Sub-Rail Power

V_1P2

• Voltage: 1.2V
• Source: V_3P3
• Purpose: KSB Power
• Not present on Trinity

V_1P8

• Voltage: 1.8V
• Source: V_5P0 (Trinity), V_3P3 (Corona and newer)
• Purpose: Southbridge and HANA Power

V_3P3

• Voltage: 3.3V
• Source: V_12P0
• Purpose: Southbridge and HANA Power, Sub-Rail Power

V_5P0

• Voltage: 5V
• Source: V_12P0
• Purpose: USB and Sub-Rail 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: CPU PLL Power

V_CPUVCS

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

V_MEM

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