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the regular ATX has a 20 pin power connector, while the enhanced ATX power connector has 24 pin power connector.
If it as a 20 or 24 pin connector and a 4 pin connector then it is a ATX power supply.
A regular ATX motherboard uses a single 20-pin P1 connector with optional 4-pin auxillary power connector
20 pin P1 connector.
At smps have only 20 pin power connector atx have 20 + 4 pin power connectors atx smps 24 + 4 pin power connectors at (advanced technology)is old model smps atx (advanced technology extended) is new model
ATX version 2.2 allowed for 24-pin P1 connector, which is backward compatible with the 20-pin P1 connector.
ATX Ver 1.0 has one 20 pin port ATX Ver 1.1 has one 20 pin port and a 4 pin port ATX Ver 2.0 has one 24 pin port and a 4 pin port
The atx 12 connector is one of the motherboard power connectors and used for 12 volt power connect for cpu voltage regulator.
Most of modern motherboads use 24 pin power connector (ATX 2.x). Older motherboards use different type that uses only 20 pin connector. ATX 2.x is usually backward compatible with older 20 pin connector.
systems that have the standard ATX motherboards.
A 20 pin connector.
There should be a large connector coming from the Power Supply unit. You may have a 20 pin or a 24 pin connector on your motherboard. Most power supplies come with a 20+4 pin connector which allows them to connect to both 20 and 24 pin mother bards.