One of the biggest legacy characteristics of the modern PC is how the power supply connects to the motherboard – not only is it one big chunky 24-pin power connector in to the board, but it has to supply all of the relevant voltages, including 12 V, 5 V, and 3.3 V. Over the last two decades, standards that used 5 V and 3.3 V have almost disappeared, except for a last few legacy applications. Despite that, we’ve been lumbered with the old ATX12V standard for this. However recently the ATX12VO standard was announced, requiring only 12 V into the motherboard and other voltages to be derived from it on the board. This also allows the power supply to be more efficient and compact, with a smaller connector. At the time, given the ubiquity of the ATX12V standards, we were all under the impression that ATX12VO would be something for the embedded market, where the full hardware stack could be customized top-to-bottom. A blog post from Intel showcased the first consumer motherboard with the standard from ASRock, and we reached out to ASRock for more details. They have now put up a product page for this board, the ASRock Z490 Phantom Gaming 4SR.

Intel's Stephen Eastman, Platform Power Specialist

In Intel’s Blog Post, the company states that the new ATX12VO standard will help substantially with idle power of a PC, due to the single rail design not needing to cater for other voltages other than 12 V. The company states that governments will benefit a lot from this, given that the standard complies with upcoming standards for electronic efficiency in the US and Japan. It notes that while there have been single rail custom designs in the past, this new industry standard will allow vendors to unite under a single implementation. One of the key partners for this is ASRock, who state that they are Intel’s primary partner on this project.

On the face of it, the new ASRock Z490 Phantom Gaming 4SR looks very much like what a user should expect from a Z490 motherboard, with a socket, power delivery, PCIe slots, and other additional controllers. What makes it stand out is the power supply connection, as defined in the standard (or Intel reference manual).

The main power comes from the first 10-pin connector, which provides up to 288 W. For small and medium sized motherboards, this should be the only power that is needed.

Additional power for high-end motherboards that need it come from a 6-pin connector, which can provide another 288W.

Note that the 8-pin 12V CPU power is still required for the processor – the 10 pin (and 6-pin) here give power to the components on board, and the PCIe slots.

There are additional connectors for storage, for motherboards that need it. This is primarily for motherboards that use a lot of SATA connectivity, or use the motherboard to provide the power to the SATA drives or ODD units, which is particularly common in embedded systems. In the case of the ASRock board, we have four SATA connections and an M.2 slot.

What makes this perhaps a little strange is that although this new ATX12VO standard is aimed at the lower power parts of the market and the more embedded designs, ASRock has made this a full Z490 board. It supports overclocking and fast memory, it has better gold-pin plating in the DRAM slots, there’s an ALC1200 audio codec, 802.11ac Wi-Fi, and so on. That being said, the PCIe slot layout is only x16 from the CPU and x4 from the chipset, rather than an x8/x8 design.

As to when this motherboard goes on sale, we’re not quite sure – very likely it will be region limited as well. It depends on how well the power supply industry gets into gear with their ATX12VO products for consumers as well.


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  • Tomatotech - Thursday, May 7, 2020 - link

    These ASRock Rack boards are amazing. If only there was an AMD version that cost around $150, not the $400 these boards seem to be at.

    If a B550 board comes out with 2x nvme and 4 ram slots, I will be very very tempted. I have more or less all the parts waiting to be built.
  • svan1971 - Sunday, May 10, 2020 - link

    God help you if you need a warranty claim with AsRock, you've been warned.
  • Tomatotech - Thursday, May 7, 2020 - link

    Finally! I won’t pretend to understand the power delivery details in the article but the ATX PSU standard looks to me like a horrible dinosaur. It was perfectly suited to computers of 20 years ago but things have changed and it needs to die.

    <Looks from giant ATX PSU to the tiny picoPSU units, laptop power units, and other mini PSU stuff lying on my desk>

    Ok if you want a 750 watt monster then ATX PSU makes sense, but 99% of modern desktops don’t need that much power. I have an i3-6100 and nvidia 1060 and 12TB of storage running quite happily on a 150w PSU (I think- it’s been a while since I built it).
  • svan1971 - Friday, May 8, 2020 - link

    So intead of 2 plugs to my board I now get 5. Great I bet it looks better with all those wires dangling too.
  • Dug - Sunday, May 10, 2020 - link

    About time they do something, but it's still not enough.

    Look at what Apple did with the power supply in the iMac Pro.
    Very thin and efficient, without giant pin connections everywhere.
    And they somehow manage to power 370w for cpu, 128GB ram, 4TB ssd, Radeon Vega 64 with 16GB memory, a 5k display, speakers, 4x 40x tb3 ports, BT, camera, and 4 usb ports.

    No, you don't need giant cables going to separate parts of the motherboard or video card. You need a new standard, and this isn't fixing much.

    Why is PC so frickin bulky?
  • Dug - Sunday, May 10, 2020 - link

    And stop with the stupid ATX motherboard. So much wasted space and completely unnecessary.
  • zodiacfml - Tuesday, April 20, 2021 - link

    coming back to this article as this needs to happen sooner! i'm crypto mining and recently acquired a used 1200w HP server power supply. It is just crazy good as it is tiny and efficient! It may have a small fan but it is quiet if not at full load. We need to reuse these perfectly fine and better PSUs for PC builds!

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