The spec includes a full set of electrical and physical guidelines for building a PSU that will be compatible with 12VO systems, including CFX, LFX, SFX, TFX, and Flex ATX versions (CFX12VO, LFX12VO, etc.), as well as recommendations for connectors and cables. ATX12VO uses a single 10-pin connector to replace the existing 24-pin ATX connector, and as the name implies, the PSU would provide nothing but a single rail of 12V power across all cables. Most MOLEX 4-pin connectors only use 12V and ground, skipping the 5V line altogether.ģ.3V and 5V power is used much less in PCs now than it was when the ATX spec was being written decades ago, and is being used less all the time, so Intel has published a PSU spec they call “12 Volt Only” (12VO). 3.3V and 5V rails are mostly used for things like some RGB strips on 5V, some peripherals, and storage devices. PCIe 6/8 pin connectors, ATX12V, and EPS12V connectors use only 12V and ground. Power supplies provide 12V, 5V, and 3.3V power to motherboards, divided into three distinct “rails.” Of the cables included with most modern PSUs, there are 5V or 3.3V pins only in the 24-pin ATX, MOLEX 4-pin, and SATA power connectors. Note that the Intel ATX12V spec is also responsible for such things as a 120mv ripple requirement, highlighting just how old this is. Technically, ATX refers to the form factor and general design (currently on version 2.2) and ATX12V refers to specifically PSU features (currently on version 2.52). Intel published the original ATX (no -12VO) spec for motherboards and PSUs back in 1995 and the ATX12V (no -O) spec in 2000, from which we can draw two important conclusions: first, ATX12VO is a revision of Intel’s own technology rather than Intel attempting to seize the reins out of nowhere, and second, the ATX12V spec is old. Note that this was already published as a video on our channel, found here: Higher-end gaming pre-builts use retail motherboards, which is where questions start to emerge. A lot of pre-builts, especially fromtraditional OEMs, use motherboards that can’t be bought retail. These regulations apply to pre-built systems, not to DIY enthusiast systems, but the recent question has been whether that’ll slowly creep outward from pre-built and into DIY. The difference today is that Intel is moving to standardize these types of power supplies, and the primary reason is to more easily meet efficiency requirements set by government bodies. Although these have existed, they weren’t standardized and often used proprietary connectors or power supplies. In these systems, the motherboards are outfitted with all the DC-to-DC bucks and boosts necessary for drives. Companies like Dell, HP, and Lenovo - especially HP - have been using a form of power supplies with only 12V in their systems for a long time now. We should start with this notice: 12VO, in a sense, isn’t actually new.
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