Rosewill Computer Case 422 Technical Information PDF herunterladen (Seite 57)

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Chapter 4 • Disassembly and Power

20-pin power

connector

from power

supply

24-pin motherboard

power connector

+3.3v +3.3v

+3.3v –12v

GND GND

+5v PS_ON#

GND GND

+5v GND

GND GND

PWR_OK –5v

+5vsb +5v

+12v +5v

+3.3v GND

Pin 1 Pin 13

Pin 12 Pin 24

Figure 4.21 ATX 24- and 20-pin motherboard connectivity

A high-quality power supply delays sending the power good signal until all of the power

supply’s voltages have a chance to stabilize. Some cheap power supplies do not delay the power

good signal. Other cheap power supplies do not provide the power good circuitry, but instead,

tie 5 volts to the signal (which sends a power good signal even when it is not there).

The number and quantity of connectors available on a power supply depends on the power

supply manufacturer. If a device requires a Berg connector and the only one available is a

Molex, a Molex-to-Berg connector converter can be purchased. If a SATA device needs a power

connection, a Molex-to-SATA converter is available. Figure 4.22 shows a Molex-to-SATA con-

verter and a Molex-to-Berg converter.

Figure 4.22 Molex-to-SATA and Molex-to-Berg converters

Power supply connectors can connect to any device; there is not a specific connector for

the hard drive, the optical drive, and so on. If there are not enough connectors from the power

supply for the number of devices installed in a computer, a Y power connector can be pur-

chased at a computer or electronics store. The Y connector adapts a single Molex connector to

two Molex connectors for two devices. Verify that the power supply can output enough power

to handle the extra device being installed. Figure 4.23 shows a Y power connector.

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Rosewill Computer Case 422 Technical Information Seite 57