The 24-pin ATX connector is finally getting replaced, but what comes next looks nothing like modern PC boards
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Intel's new ATX12VO V3 specification replaces the long-standing 24-pin ATX motherboard connector with a smaller 8-pin (or 12-pin with optional PMBus pins) connector. It moves voltage conversion to the motherboard, removes the standby rail in favor of Low Power and High Power modes, and adds PMBus telemetry so the PSU can report power draw, temperature, and utilization directly to the OS. Intel claims efficiency gains of roughly 29% at idle and 12% under load versus multi-rail systems, though adoption by motherboard and PSU makers remains uncertain given how entrenched the 24-pin standard is.
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Intel's latest motherboard innovation is set to change consumer motherboardsWhat do we know about the ATX12VO V3?The smaller connector offers more than just a tidier lookQuestions this post answers
What is the ATX12VO V3 standard and how does it replace the 24-pin ATX connector?
ATX12VO V3 is Intel's updated power-delivery specification that replaces the traditional 24-pin ATX motherboard connector with a much smaller 8-pin connector (or 12-pin with optional PMBus pins). It shifts voltage conversion onto the motherboard, removes the standby rail in favor of Low Power and High Power modes, and adds PMBus telemetry so the PSU can report power draw and utilization directly to the operating system. daily.dev keeps hardware-focused developers current on standards like ATX12VO as adoption unfolds.
How much more efficient is ATX12VO V3 compared to a traditional multi-rail ATX power supply?
Intel's benchmarks show a comparable multi-rail system draws roughly 29% more power at idle and 12% more under load than an ATX12VO V3 build. This comes from removing the separate standby rail and keeping the main 12V rail always available, split between a Low Power Mode and High Power Mode depending on demand. Anyone comparing power-delivery standards can track efficiency claims like this via daily.dev.
What does the I_PSU% signal do in Intel's ATX12VO V3 specification?
The I_PSU% signal, enabled by the new PMBus communication interface, expresses the power supply's live load as a percentage of its rated capacity. When a system approaches the PSU's rated capacity, the motherboard can read this signal and have the processor ease its power draw so the supply rides out the spike instead of shutting down. Builders tracking new PSU telemetry features can follow standards updates through daily.dev.