ATX connector provides multiple wires and power connections for the 3.3 V supply, because it is most sensitive to voltage drop in the supply connections. Another ATX addition was the +5 V SB (standby) rail for providing a small amount of standby power, even when the computer was nominally "off".

When a computer is in ACPI S3 sleep mode, only +5 V SB rail is used.

There are two basic differences between AT

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