It is well known that the specifications for ATX 3.0 and PCIe 5.0 are closely intertwined and many things have also found their way into each other’s standardization. Also the many articles I already wrote about the 12VHPWR connector, i.e. the 12+4 pin, already gave a lot of insights there. It can also be assumed that the new, powerful graphics cards with a TDP beyond 300 watts will come with the new power connector. So why another article? The reason is quite simple, because interesting loopholes seem to have been built into both standards. However, it pleases and confuses the customer in equal measure.
If you remember my comments about transients (load peaks) and ATX 3.0 (transient response tests), you will also know that the upcoming ATX 3.0 power supplies of 450 watts and up will not only have to have the new 12VHPWR connector, but will also have to pass the transient response tests with up to 200% load in the 100-ms window. By the way, we have the graphics card manufacturers to thank for the fact that this quite high hurdle exists for many power supplies. They made sure that the PCI SIG included this madness bindingly in the PCIe 5.0 standard for all cards with a TBP of 300 watts or more. But is that actually true at all?
Of course, you cannot directly compare individual load peaks in the PCIe 5.0 definition with the load cycles of the power supplies in the ATX 3.0 document, but these cycles are logically based exactly on what was previously included in the PCIe 5. Specification was included. But even in the PCIe 5.0 definition, all of these designs as shown always refer to the 12VHPWR connector when talking about “novel cards with 300 to 600 watts of power consumption”.
To make the confusion complete now: There is actually also no binding regulation that a manufacturer now really has to use the 12VHPWR connector for cards between 450 watts and 600 watts at all instead of e.g. three 2×4 connectors (6+2-pin)! Theoretically, you could also use up to four 4×2 ports to reach the maximum 600 watts, at least mathematically. In conversation with some board partners and on the question whether there will still be the known adapters from 12VHPWR to e.g. 3x 6+2 pin as accessories to the cards, came a rather clear “at the current state probably rather yes”.
However, they are sure that the soon to be released cards from NVIDIA and AMD will still work with current power supplies of sufficient size and quality and that the customer doesn’t have to explicitly buy a new ATX 3.0 power supply with a native 12VHPWR connector. I interpret this as an all-clear and a rejection of the marketing of the power supply manufacturers, who may have already been looking forward to new sales. So the PCI SIG and the PCIe 5.0 standard are not entirely clear on whether the new cards really need to have this 12VHPWR connector. And this is exactly the question I have been putting off for weeks. But what about the new ATX 3.0 standard and the higher requirements for the corresponding power supplies? There it becomes likewise exciting, because my friend Aris discovered there also still something!
Here in advance once again to read what was known so far:
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