Specifications

Power Specifications
Power Delivery
Chapter 684
5 V Standby Supplies power to:
• Diag LEDs
• Network activity LED
• Hard disk drive activity LED
• Power LED
• Local Area Network (LAN) connector
• Universal Serial Bus (USB) connector
• PS2KB
• Winbond WB782D hardware monitoring ASIC
• 3.3 VSB
• SB1_8V
VCC_CORE The exact processor voltage is determined by VID
bits from the processor(s).
In a dual-processor system, the processors share a
power plane. A single VCC_CORE is generated by a
+12 VDIG to VCC_CORE dc-to-dc converter that is
placed on the system board. This is called VR down.
The maximum current each processor can draw is
57 A.
1.5 V This 1.5 V supply is generated from a three terminal
regulator on the system board. The current is limited
to 5 A.
1.8 V This supply is used for the Intel 860 Memory
Controller Hub, the P64H, and the MEC. It is
generated by a switching dc-to-dc converter. the
output voltage is 1.8 V and the output current is
limited to 15 A.
A separate 1.8 V power supply is used for the ICH2.
This 1.8 V supply is generated from a three terminal
linear regulator which limits the output current to
1A.
2.5 V This supply is generated by a voltage regulator on
the Memory Expander Card (MEC).
Table 6-1 Power Signal Description
Supply Description