In apparent acknowledgment of this fact, Intel's power supply design guide rev.1.2 made this requirement recommended rather than mandatory. In reality however, as far as I know most manufacturers ignored this requirement and wired both +12V1 and +12V2 lines to the same physical output with combined overcurrent protection. The rev.2.0 spec also called for a separate current limit on 2x2 connector, which was referred to as +12V2. The designations of the original 20 signals left unchanged for backwards compatibility (see the ATX power connector pinout diagram to the right and also see our guide on interchangeability between ATX versions). In the revision 2.0 of the ATX PSU specification, P1 changed to a 24-pin part for higher power. Later on IntelĀ® introduced so-called ATX12V that differed by an additional 2x2 +12V connector (you can find information on the auxiliary cables here). Relative to the old AT-style, it had three new rails: +3.3V, +5VSB and PS_ON# line for remote ON/OFF. ![]() ![]() When ATX form-factor was designed, it first employed a 20-pin dual-row P1 with 6A/pin rating.
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