Source voltage Description
+5.1V Storage (hard drive, optical drive, diskette drive), PCI, PCI Express, ICH9R,
audio, keyboard/mouse
+12 V-B PCI, PCI Express, and system fans
+12 V-D Storage (hard drive, optical drive, diskette drive), PCI Express x16 auxiliary
connector
+12 VCPU0 Input to onboard regulator that supplies power to processor 0.
+12 VCPU1 Input to onboard regulator that supplies power to processor 1.
+12 V-M Input to onboard regulators that supply power to memory and chipsets.
-12V PCI, serial ports
+5 VSB Sleep circuitry
Table 1-6 Maximum current per rail
Voltage rail Maximum continuous current
+3.3V 18A
+5.1V 21A
+12 VCPU0 14A
+12 VCPU1 17.5A
+12 V-M 17.5A
+12 V-B 18A
+12 V-D 12.5A
-12V-N 0.15A
+5.1 VSB 3A
WARNING! Do not exceed 125W of combined 5V and 3.3V power.
Do not exceed 51.5A of 12V (CPU0/CPU1/M/B/D) power combined.
Do not exceed 650W of total continuous output power.
Power supply specifications
Table 1-7 Power supply specifications
Item Description
Power supply 650 watt custom power supply – (Wide
Ranging, Active Power Factor Corrected)
Operating input voltage range 88 – 269 VAC
Rated input voltage range 100–240 VAC
Rated input line frequency 50–60 Hz
Table 1-5 Power supply source voltages (continued)
8 Chapter 1 Product overview ENWW
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