I'm not sure this is quite right, though I get where it's coming from. Unless I'm missing something, ATX3.1 PSUs, which have been around for a year or so now, might be ok. ATX3.0 PSUs might be a bit dodgier. Corsair have a bit of a corporate-sanitised explanation up.
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NVIDIA RTX 50 SERIES - Technical/General Discussion
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I think its PCI-SIG that sets out the rules for what can be labelled as H+ and H++ (which in the case of the cables is just chronological - if your previously H+ cable is made after the date of the new spec, you can then put H++ on it).
Specifications | PCI-SIG
pcisig.com
Regretfully you can’t (legitimately) access those specs without a very pricey membership…!
If JonnyG is to be believed, there is technically no difference between the cables as far as PCI-SIG is concerned. If it can be used with 12VHPWR, it can be used with 12V-2x6. The changes to H++ only apply to the connector, not the cable.
I don't have a clue, all I'm going off is what he said in the article, guy knows his stuff.
I think the point - and I may well be wrong here - is that having a 12v-2x6 on the GPU end but a 12vhpwr on the PSU end is risky, as if the PSU-end cable isn't seated perfectly, you're going to get those horrifying temperatures.
If you have a 12v-2x6 at both ends, which you will have with an ATX3.1 PSU (but not an ATX3.0), the risk is reduced.
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Wouldn't using the supplied 8pin splitter offer more redundancy for error than a 12vhpwr cable?
Not unless you have a power supply with multiple power rails. Even then that might not help, best case in the event of an overload the PSU goes into over-current protection and shuts down, but more likely if the power rail is strong enough it will probably still melt the connector.
The problem is that these new GPU's have such large transient power requirements that you pretty much need a PSU capable of delivering enough power to melt the cable/connector.
Long term the only real solution is to load balance each of the conductors in the 12vHPWR/12v 2x6 cable, that can either be done at the GPU side (as it was for the 30 series) or in theory it can be done on the PSU side (but no MFR has ever implemented this).
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If you have 4 separate 8-pin plugs (or whatever plugs on the PSU side that correspond to the 8-pin connector at the GPU end) at the PSU side, then you would have more redundancy up to the point it all comes together at the 12VHPWR connector itself (on the adapter).
More cables, more connectors etc.
The adapter adds some possible failure points with the four 8-pin connectors, but those connectors have a safety margin such that I have not seen a single instance of the 8-pin side of the adapters failing.
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How so? It all joins to become one pool of 12v anyway. Redundancy would be multiple seperate cable that plug into their own PSU and GPU connector; I know it's a strange concept but think about it, some day it's going take off
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Soldato
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What in the name of... why in the name of all thats holy did Nvidia decide to reduce the load balancing shunt resistors down from 3 to just 1, where its possible 600W can potentially be routed through a single wire and nothing be flagged as wrong by the card? Its mind blowing. The only possible conclusion its possible to come to is that they cut down on the power regulation circuitry for the simply expendient of saving a few quid on components and increasing their profit margins some more %. I can't even. This is bloody typical Nvidia though they removed the power regulation from the card and probably expect the PSU manufacturer to pick up the slack and supply the circuitry instead at extra cost to them and not to Nvidia. Meanwhile it means that if the the plug isn't plugged in properly or fully or if for some unforeseen reason all but one of the wires become broken or otherwise unable to supply current its possible for 600W to be pushed through a single wire and and if the wire gauge isn't sufficiently thick enough for it to actually catch fire. Unbelievable.
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