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What are the main differences between the AT and the ATX form factors?
Wiki User
∙ 14y ago
The AT form factor measures 12" x 13.8" compared to the smaller ATX at 12" x 9.6". The power supplies for AT systems supply +5, -5, +12, and -12 volts to the motherboard and other components, and uses two power connections, the P8 connector and the P9 connector. The power supplies for ATX systems supply the same voltages plus a +3.3 volt circuit for alow-voltage CPU, and use a single power connector called a P1 connector.
AT motherboards, which are no longer produced, were difficult to install, service, and upgrade and with the AT form factor the CPU was placed on the motherboard in front of the expansion slots resulting in long cards not fitting because they bump into the CPU.
On an ATX motherboard, the CPU and the memory slots are rotated 90 degrees from the position on the AT motherboard, so instead of sitting in front of the expansion slots, the CPU and memory slots sit beside them allowing the use of full length expansion cards.
Wiki User
∙ 14y ago
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