ATX 3.1 Availability

Sin_Chase · 24 Feb 2024 at 14:25

I've seen that a few manufacturers have announced ATX 3.1 PSUs at CES and otherwise, had anyone seen/heard anything about availability?

I'll be replacing my aging PSU soon owing to fan noise, despite a good near 10 years of service!

My GPU doesn't require 12VHPWR but I want a new PSU to support ATX 3.1 (and 12V2x6) for when I eventually do get a new GPU.

Not much talk about but from what I can find availability appeared to be anticipated around now/Q1.

Tetras · 24 Feb 2024 at 14:47

hwbusters has a review of MSI's updated A1000G PCIE5, so I imagine it should be soon (within a month or two), though I think MSI's GL PSUs were already shipping as 12v2x6, so this might just be a recert and rebadge for some PSUs.

pre · 26 Feb 2024 at 07:56

Is there any functional difference apart from the 12V-2×6 cable?

Tetras · 26 Feb 2024 at 13:25

pre said:
Is there any functional difference apart from the 12V-2×6 cable?

According to hwbusters, the holdup time has been reduced (downgraded) and the PSU has to support the motherboard having spikes through the PCI-E slot.

I’m afraid I have to disagree with the change at 12ms @ full load from 17ms. This is wild because, in this section, ATX v3.0 PSUs are better than ATX v3.1 ones! Intel contacted UPS manufacturers to confirm that the switch to battery time is lower than 12ms. Still, in any case, hold-up caps age, losing capacity, and besides that, it is always better to have more reserve power.

So far, the 12V rail was limited up to 5.5A on the PCIe slot, and according to the new ATX v3.1, it can have spikes up to 13.75A for 0.1ms or 165W (with a nominal voltage of 12V).

ATX v3.1 & PCIe CEM 5.1 are official! - Hardware Busters

Hardware Busters - ATX v3.1 & PCIe CEM 5.1 are official! - PSUs

hwbusters.com

DavieJG · 26 Feb 2024 at 16:58

Felt like the atx standard was static forever now is changing every 2 minutes. Is this the last tweak for the foreseeable?

Tetras · 26 Feb 2024 at 17:42

DavieJG said:
Felt like the atx standard was static forever now is changing every 2 minutes. Is this the last tweak for the foreseeable?

There's more than a few voices who say the 12vhwpr / 12v2x6 is just fatally flawed and will never be 100% 'fixed', but who knows.

DavieJG · 26 Feb 2024 at 17:45

Tetras said:
There's more than a few voices who say the 12vhwpr / 12v2x6 is just fatally flawed and will never be 100% 'fixed', but who knows.

Too much current down not enough copper?

pre · 26 Feb 2024 at 18:24

Tetras said:
ATX v3.1 & PCIe CEM 5.1 are official! - Hardware Busters

Hardware Busters - ATX v3.1 & PCIe CEM 5.1 are official! - PSUs

hwbusters.com

So in laymans - no? Trying to work out if this'll push Corsair to update their HX1500i - which is 3.0 - or release a new AX1600i...