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What is the motivation of intel to want PSUs that are 12V only?
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NiHaoMike:
The adoption of USB-C that supports adjustable voltage is phasing out a lot of 5V rail load.
madires:
Many high efficiency ATX PSUs have just a 12V secondary anyway, i.e. the other voltages are created by DC/DC converters fed by the 12V rail. This design improves the overall efficiency. No need to mess around with regulating multiple secondaries. Moving the DC/DC converters to the mainboard will help a little bit more with the efficiency.
tszaboo:
In the server world, this switch was made a long time ago . It resulted a much smaller power supply. An DC-DC stepdown is now probably cheaper than the wire and the connector. But I really hope they dont stop here, and finally design a successor for the ATX (not BTX) because this one is getting outdated. Without the 5.25" stuff if possible please. And power and data through 1 cable for drives please.
tooki:

--- Quote from: epigramx on March 05, 2020, 10:31:24 am ---
--- Quote from: Rerouter on March 05, 2020, 10:13:43 am ---Almost all high power computer switching supplies are built around using the 12V rail, with RAM and onboard peripherals barely pulling anything from the 5V rail, and due to the whole molex/sata thing, even 3.3V rails are getting less popular, as its not hard to locally down convert from 5V.

the RAM and other mid current loads on a motherboard are not hard to shift back to the 12V rail, in fact a number of overclocking boards already do this to save costs on unique parts when you need high current power stages.

When you pulling say 40A @ 12V, loosing 2-3W in switching losses for the lower power low voltage rails may be much better if you gain back 30W on the initial conversion of that high current load.

--- End quote ---
So you're implying they're going to favor very high power PCs with this and consider low power desktops a minority.

--- End quote ---
No, it's not "favoring" them. High-power PCs simply represent the larger challenge; low-power ones will still benefit.
tooki:

--- Quote from: NANDBlog on March 05, 2020, 03:15:28 pm ---In the server world, this switch was made a long time ago . It resulted a much smaller power supply. An DC-DC stepdown is now probably cheaper than the wire and the connector. But I really hope they dont stop here, and finally design a successor for the ATX (not BTX) because this one is getting outdated. Without the 5.25" stuff if possible please. And power and data through 1 cable for drives please.

--- End quote ---
And also, doesn't 12V only also make it super easy and efficient to provide battery backup using 12V SLA batteries, instead of complex and inefficient UPSs? I recall reading years ago about Google rolling its own motherboards using 12V only, with a connector for a 12V battery right on the mobo.
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