HP Workstation x4000 hp workstation x4000 - Technical Reference manual - Windo - Page 84
Power Specifications, Controller Hub, the P64H, and the MEC. It is
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Table 6-1 Power Specifications Power Delivery Power Signal Description Supply 5 V Standby VCC_CORE 1.5 V 1.8 V 2.5 V Description 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 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. This 1.5 V supply is generated from a three terminal regulator on the system board. The current is limited to 5 A. 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 1 A. This supply is generated by a voltage regulator on the Memory Expander Card (MEC). 84 Chapter 6