Thursday, March 3rd 2022
Intel ATX 3.0 16-pin Power Connector for PCIe Gen5 is Smart, Has Four Power-Delivery Variants
Intel is reforming the ATX specification in a big way with ATX 3.0, and power supplies shipping with new 16-pin power connectors for the next generation PCI-Express Gen 5 graphics cards. The 16-pin 12VHPWR (12-Volt High Power). The need for a new connector standard is arising from the growing power demand from graphics cards, as contemporary high-end GPUs crossing the 375 W barrier (two 8-pin PCIe inputs), and some of today's high-end cards even shipping with typical board power values of 450 W at stock frequencies. Custom-design cards based on these GPUs create cable-spaghetti in your case, as they come with three or more 8-pin connectors. To solve these problems and more, Intel innovated the 12VHPWR.
The 12VHPWR connector has 12 electrical pins and 4 side-band pins, for a total of 16 pins. The side-band pins enable low-fi communication between the power-supply and the graphics card, and two of these pins, labeled "SENSE0" and "SENSE1," let the graphics card know what kind of connector is plugged in, so it can accordingly adjust its power-management. There are four variants of the 16-pin connector based on the electrical capability offered by the PSU. These include 600 W, 450 W, 300 W, and 150 W. The arrangement of the two SENSE pins is how the graphics card tells the four apart.The 12VHPWR connector delivers power in two system states—Initial Permitted Power, and Maximum Sustain Power. The former defines a power-delivery limit when a system is powered up and awaiting boot (up to the stage of the graphics driver to get loaded). The latter is the limit allowed once the driver takes over (software configuration). The table above shows the various power configurations. Will this cause chaos? We don't think so. Any graphics card with a 16-pin connector will take in any connector, and if the connector doesn't meet its requirements, the GPU will default to the lowest power spec, and adjust its frequencies accordingly (performance will be affected). The GeForce RTX 3090 Ti Founders Edition is (or was supposed to be) the first graphics card with a 16-pin (12+4 pin) connector, including the side-band stub, even though the GPU doesn't support PCIe Gen 5.
Sources:
momomo_us, Wccftech, VideoCardz
The 12VHPWR connector has 12 electrical pins and 4 side-band pins, for a total of 16 pins. The side-band pins enable low-fi communication between the power-supply and the graphics card, and two of these pins, labeled "SENSE0" and "SENSE1," let the graphics card know what kind of connector is plugged in, so it can accordingly adjust its power-management. There are four variants of the 16-pin connector based on the electrical capability offered by the PSU. These include 600 W, 450 W, 300 W, and 150 W. The arrangement of the two SENSE pins is how the graphics card tells the four apart.The 12VHPWR connector delivers power in two system states—Initial Permitted Power, and Maximum Sustain Power. The former defines a power-delivery limit when a system is powered up and awaiting boot (up to the stage of the graphics driver to get loaded). The latter is the limit allowed once the driver takes over (software configuration). The table above shows the various power configurations. Will this cause chaos? We don't think so. Any graphics card with a 16-pin connector will take in any connector, and if the connector doesn't meet its requirements, the GPU will default to the lowest power spec, and adjust its frequencies accordingly (performance will be affected). The GeForce RTX 3090 Ti Founders Edition is (or was supposed to be) the first graphics card with a 16-pin (12+4 pin) connector, including the side-band stub, even though the GPU doesn't support PCIe Gen 5.
56 Comments on Intel ATX 3.0 16-pin Power Connector for PCIe Gen5 is Smart, Has Four Power-Delivery Variants
ICYMI:
www.techpowerup.com/forums/threads/pcie-gen5-12vhpwr-connector-to-deliver-up-to-600-watts-of-power-for-next-generation-graphics-cards.287682/
www.amphenol-icc.com/product-series/minitek-pwr-cem-5-pcie.html
however i would not want to pay for custom cables that used short cuts; no matter of any potential problems; its an aesthetic thing.
Even if we ignored all this, are we at a point where existing PSU's are about to become obsolete?
www.igorslab.de/en/power-supply-insanity-connector-chaos-and-transient-drama-when-pure-waste-of-resources-gets-elevated-to-the-new-standard/2/
They are free to develop even lollypop's with the AMD logo, I am not going to buy any.
PSU and power standards this is another topic.
They are standards simply defining energy consumption.
They are standards simply defining compatibility with old and new INTEL hardware.
Existing PSU they have product design date.
It is obligation of the educated consumer, him to select the PSU which this is the best combination of both worlds.
Vast majority of Gamers will never buy any RTX 3090.
RTX 3000 this is an engine also capable for computation, some though to use that for medical research, others might use it for other applications.
Some are in denial to accept the fact, that NVIDIA does not begging any gamers them to become their customers.
There is a larger picture behind all these recent planing.
They might be after for a special workstation for face recognition, or a special workstation for astronomers, or something more boring. :)
/OT though
www.mouser.com/ProductDetail/Amphenol-FCI/10132447-111PLF?qs=KVgMXE4aH4lVRPXcCnDrdA%3D%3D, those are specified if you look at the documentation linked on the product page in my previous post.
this isn't my first rodeo if i spend the time i can find dozens of terminals/pins that support 11amps/16awg in the mouser and digikey catalogs. . don't know why you think they're hard to find.
edit: that mouser links seems screwy, same thing on digikey:
www.digikey.com/en/products/detail/amphenol-icc-fci/10132447-111PLF/7590954 you should look closer, those do not carry 12v.
(all you really need is continuity) :)
not to go far off topic but i remember when this guy started as an artesian on OCN (back w/it was a better forum) too bad he's no longer around but his youtube channel is still informative:
www.youtube.com/channel/UCT7p3y4df3uwYYZI7bcdJAA
though i am not going to disagree that its not for everyone, esp those who are danerous w/a screwdriver, like my brother. :laugh:
edit; sorry wrong data sheet. TLDR:
just google these part #s :rockout:
You can get a PSU that physically fits, but oops no special connector says no good
www.tomshardware.com/news/intel-atx-v3-psu-standard
75w pcie slot power
6 Pin 75w
8 pin 150w
if a card will have 500w it can be used like the past 13 years:
3x 8pin 450w + pcie slot 75w
Another thing will be if the stock cards will get up to 600w, how the hell will they cooling it without a jet noise?
Anyways ill not change my 2 year old psu cause idiotic new standard, then ill be limited to old cards or even to cards with max. 75w via the slot.:cool:
though i can't see anyone trying to save a few bucks per one thousand parts to put their reputation at stake cheapening out on parts. its a shame those links didn't work out for you or you would see that on both digikey and mouser's catalogues. as far as aesthetic uniformity; i'm very sure the same paracord used for the 16awg wires would at least accommodate two of the 28awg sense wires if not all four. and on a side note, i recommend reading aris' article i posted before -turns out just two of the four wires are required: so hey! there goes half the problem! right?! :p
though seriously, new combs will need to arrive to market anyhow since 4, 6, 8, and 24 space combs are common but no 12/16 spacers. i'm sure comb manufacturers (whoever they are!) can design a mold to inject some plastic that will make (most) all people happy. its not like those are expensive anyhow.
granted if there is a market for it . .
it will be fine. don't be a debbie downer.
I have no doubt serious outfits will threat this properly, and keep making high quality cabling as they have been doing. Knowing that scene, they'll probably come up with some smart and good-looking solution (using two two-conductor 28AWG wires roughly matching the size of a single 16/18AWG power wire would be one solution). But that's not what I've been talking about in this thread, and has little to no relation to the potential problem I'm bringing up.
however that did not mean i am not aware of cablemods (who is much bigger than lutro0 every was and mass produce sets as your example. and custom sets sold through caseking, moddymymods or performacePCs. along what is sold through corsair, seasonic and evga are custom sets, the garbage on ebay, aliexpress, newegg and amazon are not custom sets unless sold by any of the aforementioned.
my point is crap like that has unfortunately always been there and will likely always be, c'est la vie. the best anyone can do is have reasonable, informative (why i am posting data/spec sheets) public discussions to help the uninformed make sound choices.
I haven't been "hurt" by bad cables since I have the knowledge to know what to look for, but I've seen plenty of reports of burnt PSU extensions and similar garbage. My only personal experience with fake wiring was the 12V feed on a cheap PCIe riser (that I had no plans on using, and spotted its fakeness as I cut it off, exposing its hair-strand copper wire). But plenty of others have.
As for your laissez-faire attitude to this: that's just stupid. Seriously. Electrical safety is important. Standards pertaining to electrical safety need to be designed with this in mind across a broad range of implementations. And I'm entirely sure Intel and/or the PCI SIG didn't consider the prevalence of PSU extensions and custom wiring in DIY PCs today when designing this standard - or at least they didn't count it as important enough to avoid this blatant security issue with the design they went with. Which, while technically understandable - ultimately this is a niche thing, and entirely irrelevant to the enterprise markets they're mostly concerned about - is still poor design IMO. Of course, adding four more full-size pins has its own drawbacks. But IMO, if the choice is between "have a slightly larger plug" and "lay the groundwork for melted future fire hazards", I'd go with the larger connector every time. And if your argument is "well, if people buy this cheap stuff they deserve what's coming to them" (which does seem to be the case), that's just a bad attitude.
i've never said anything about what people deserve and there is no place for that in a reply to me. however, i will question the common sense in buying a $5 cable for a $3000+ card.
as the saying goes, you lead a horse to water . . .
good luck w/that. :)
www.tomshardware.com/news/intel-atx-v3-psu-standard
How? It was brought up earlier that similar shortcuts could be done with 8-pin PCIe wiring, as those also just need sense pins shorted to ground. But I have never seen this done by anyone, ever in real life. Why? This is speculation, of course, but it's relatively safe to assume that when you're already making a harness of 6 wires, adding two more identical wires is a low-effort undertaking, and coming up with and implementing a shortcut would likely take far more effort than it would be worth. It might even look worse in the end, as 8 matched wires likely look better than 6 matched wires + a couple of bodge wires in the plugs. And, as has been central to my argument all along: these people care mainly about aesthetics.
For these cables, on the other hand, there is no real option for matched cabling (unless, as I tried bringing up as a possibility earlier that you apparently misread, you could find pins for the small connector capable of holding wires of the same gauge as the power wiring - this would let you run 16 equally thick wires for aesthetic purposes, at the cost of unnecessary wiring, exotic and possibly nonexistent pins, and a lot of hassle). You'd then need to find a way to make having four much thinner wires look good alongside 12 thicker ones. How do you do that? Creative routing and combs might help, but that is labor intensive and increases QC costs, which is anathema to these actors. Two-conductor wire of rougly the same thickness as the thicker wire might work, but terminating them in a good-looking way would be a challenge. Or you could stuff two wires into one sleeve - though that would be lumpy and stiff, sub-optimal for aesthetics. The same goes for sticking single wires into oversized sleeves - plus that they would be loose, of course. The third, and suddenly more attractive option, then becomes shorting the wires to ground at the connector. This would be the simplest, cheapest (you're now saving four lengths of wire per cable, rather than the potential two on an 8-pin), and possibly least bodged-together-looking solution of the bunch. That is a problem, when the worst implementation possible has the most advantages. ............................................. I was comparing the pros and cons of going with 16 equally sized pins vs. the solution they actually went for. Was that difficult to understand? Literally the entire basis of my issue here is based on these being different, smaller pins, ffs. I would really suggest you take a step back here, as it seems you're approaching this discussion dead-set on just not understanding what I'm saying, whether consciously or not. I'm sorry if my style of writing isn't sufficiently clear, but literally nothing in the sentence you quoted above is me saying that the pins on the standard presented here are full size. And I'd agree with that assessment. But I'm also realistic enough to know that people will still do so, and that people fall victim to scammers passing off $5 cables for $100 cables, but with an impressive rebate, etc. That's why standards should prioritize safety to the degree that eliminating unscrupulous shortcut implementation possibilities should be a main goal of the design. That's how you make a safe standard - by not assuming that everyone implementing it is a good actor interested in following it. Instead, what we have here is a standard that, though unintentionally, at least partly incentivizes shortcuts.