beautypg.com

Power supply – Apple Mac Pro (Early 2009) User Manual

Page 103

background image

Chapter 5

What’s Under the Hood

103

 Signal-to-noise ratio: Greater than 90 dB

 Total harmonic distortion + noise: Less than -85 dB (.006 percent)

 Channel separation: Greater than 85 dB

External microphone input using the headphone jack (typical values)

Based on a typical situation with playback of a 1 kHz, 28 mV

rms

sine wave, 44.1 kHz

input sample rate, 24-bit sampling, unless otherwise specified below.

 Maximum input voltage: 39 mV

rms

(-26 dBu)

 Input impedance: Greater than 1 kilohm

 Signal-to-noise ratio: Greater than 60 dB

 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 6 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.