As art of my clean up I have found a Corsair case with a PSU that has
just two cables coming out, one with the big (?24 pin) connector and the other with two of the small square connectors.
Memory is struggling but is that from the days when we fed power just to
the motherboard and then plugged peripherals into the board? If so it's probably for the bin?
There is a new(ish) standard called 12VO, where the PSU feeds 12 to the motherboard, which then feeds lower voltage(s) to the peripherals.
Jeff Gaines wrote:
As art of my clean up I have found a Corsair case with a PSU that has
just two cables coming out, one with the big (?24 pin) connector and the >>other with two of the small square connectors.
sounds like ATX12V P4 connector to the CPU(s)
Memory is struggling but is that from the days when we fed power just to >>the motherboard and then plugged peripherals into the board? If so it's >>probably for the bin?
Sure you've not "harvested" the cables with 3.3/5/12 volts to drives? Or
it's a modular PSU with cables removed?
There is a new(ish) standard called 12VO, where the PSU feeds 12 to the >motherboard, which then feeds lower voltage(s) to the peripherals.
On 11/05/2024 14:30, Andy Burns wrote:
There is a new(ish) standard called 12VO, where the PSU feeds 12 to the motherboard, which then feeds lower voltage(s) to the peripherals.
Am I alone in thinking that's a pretty stupid "standard"?
Firstly, the motherboard has to provide the conversion to 5V and 3.3V
that would previously have been done by the PSU, so the cost of a board
will go up -- and you can bet that a 12VO PSU won't be significantly
cheaper than an ATX one so there'll be no saving thare. This means that
if the voltage-shifting functionality fails it will mean a new
motherboard (which will probably mean changing CPU, RAM, etc. unless the board fails when it's new enough for a like-for-like replacement) not
just a new PSU.
Secondly, the motherboard will have to handle the current needed for
drives, etc., that are now fed directly from the PSU, which means
heavier tracks and possibly more heat generated on the board.
It also means that one has to worry about the current that a motherboard
is able to handle -- and the number of power output connections provided
-- if designing a system that is to have, say, an unusually large number
of drives.
I can't see any upside, for the user. I hope 12VO vanishes without trace!
On 11/05/2024 14:30, Andy Burns wrote:
There is a new(ish) standard called 12VO, where the PSU feeds 12
to the motherboard, which then feeds lower voltage(s) to the
peripherals.
Dell, Lenovo and friends have long done that for their desktops.
I can't see any upside, for the user. I hope 12VO vanishes without
trace!
It's about having a lower cost system.
Peripherals are increasingly onboard these days - think M.2 SSDs
where we once had SATA.
The days when normal users would stuff half a dozen HDD, a DVD and aI don't think "normal" users ever stuffed half a dozen HDDs into a
tape drive in their office desktop are gone - that's what they use
NASes, servers and the cloud for these days.
Basically having a PSU pump out 5V at 20A and then use it for aYes, I see that point ... but surely that's an argument for encouraging
single 2W SSD is wasteful, so move that conversion to the mobo where
you can size the converters for the loads your system actually
expects to have. That also makes the conversion more efficient.
Maybe you only need 10W so you have a much smaller converter.
The remaining use case for high power systems is 'enthusiasts', who
won't buy an office PC from Dell anyway, or people with big GPUs. In
which case they need to swap out the in-box 200W PSU for a 600W
monster anyway.
Servers have done this for decades: big iron might have a 2.4kW PSU
that only outputs 12V, and the rest is either on the mobo, backplanes
or in a separate converter board.
I hate M.2. I like my drives in caddies so they can be swapped around
without opening the case
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