Summary

10 IT Essentials: PC Harware and Software Companion GuideTable 1-1 Power Color Codes continuedWire AT Power ATX Power ATXv12 PowerVoltage Color Use Supply Form Supply Form Supply Form–12V Blue Some types of ✓ ✓ ✓serial port circuitsand early programmableread-onlymemory (PROM)+3.3V Orange Most newer CPUs, ✓ ✓some types ofsystem memory,and AGP videocards+5V Red Motherboard, ✓ ✓ ✓Baby AT andearlier CPUs, andmany motherboardcomponents–5V White ISA bus cards ✓ ✓ ✓and early PROMS0V Black Ground: Used to ✓ ✓ ✓complete circuitswith the othervoltagesDifferent connectors are used to connect specific components and various locations on themotherboard:■■■■A Molex connector is a keyed connector used to connect to an optical drive or harddrive.A Berg connector is a keyed connector used to connect to a floppy drive. A Berg connectoris smaller than a Molex connector.A 20-pin or 24-pin slotted connector is used to connect to the motherboard. The 24-pinslotted connector has two rows of 12 pins each, and the 20-pin slotted connector hastwo rows of 10 pins each.A four-pin-to-eight-pin auxiliary power connector has two rows of two to four pins andsupplies power to all areas of the motherboard. The four-pin-to-eight-pin auxiliarypower connector is the same shape as the main power connector, but smaller.