Apple MD772LL/A Personal Computer User Manual


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112 Chapter 5 What’s Under the Hood
 Total harmonic distortion + noise: Lessthan-60dB(0.1percent)
 Frequency response: 100Hzto8.2kHz,+0.5dB/-3dB
Power Supply
AC line input
 Voltage ranges: 100–240Valternatingcurrent(AC)
 Current: Maximumof12A(lowvoltagerange)or5A(highvoltagerange)
 Frequency: 50–60Hzsinglephase
Power Requirements for Expansion Cards and Peripherals
Expansion cards
CombinedmaximumpowerconsumptionforallfourPCIExpressslotsshouldnot
exceed300watts(W).
USB devices
Eachofthecomputer’sbuilt-inUSBportsisallotted500mA.
FireWire devices
Thecomputercanprovideupto28WtotaltotheFireWireports.
System Clock and Battery
YourcomputerhasCMOScustomcircuitrywithalong-lifebattery.
Battery
Usea3-volt,BR2032lithiumcoincellreplacementbattery(see“ReplacingtheInternal
BackupBattery”onpage79).
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