Nvidia: Problems 12Vhpwr connectors are due to incorrectly plugged plugs – Computer – News

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By the best way, that design just isn’t from NVIDIA, however from PCI-SIG

That is incorrect. The design is by Amphenol, commissioned by Nvidia. PCI-SIG has solely decided the spec for the sense pins. This design is a continuation of the 12 pin Nvidia used for Amps (which in flip is an Amphenol Minitek), however as a result of they needed it standardized they needed to have PCI-SIG sense pins similar to the 6-pin and eight pin plugs. Therefore it’s now 12+4. PCI-SIG cannot cease them from utilizing the plug anyway (simply have a look at Ampère).

The “common” PCIe plugs (6 and eight pins) are designed by Molex (they’re known as Mini-Match), have a lot bigger margins anyway and PCI-SIG has decided the maximums for them – and they’re significantly decrease than on the 12VHPWR.

– 6-pin Mini-Match: 8A per pin with 16/18 AWG, good for 192W with 2 12V wires*. PCI-SIG has restricted that to 75W (39%).
– 8-pin Mini-Match: 7A per pin with 16/18 AWG, good for 252W with 3 12V wires. PCI-SIG has restricted that to 150W (59.5%).
– 12+4-pin Minitek Pwr 5.0 (12VHPWR): 9.5A per pin with 16 AWG, good for 684W. And that’s then “restricted” to 600W (87.8%).

The protection margins are already very low to start with. With the Mini-Match plugs, the utilization spec (PCIe) just isn’t even shut to what’s within the plug spec state. Subsequent, the spec of this Minitek plug can also be rather more aggressive than the specs of Molex: they permit 2.5A extra per pin, on extra pins, in about the identical house because the 8-pin Mini-Match plug. For comparability, Molex additionally has the Micro-Match connector, which is sort of similar to Amphenol’s Minitek (totally different keying). The 12-pin model of that solely permits 5.5A per pin. The 12-pin model of the Mini-Match (sure, it simply exists) permits 6A. I am going to make it even crazier: Amphenol’s Minitek 3.0 (on which this factor is predicated) solely permits 7.5A with 16 AWG for a 12-pin high-current (!) variant. See right here.

Does that imply that this plug is by definition unsafe? No undoubtedly not. That is usually performed in factories and the like. However that’s the place the sticking level lies: these are skilled functions. This can be a plug that ought to be capable of be utilized by your grandmother.

Add to that:
– The plugs and headers are poorly designed in order that the retention clip barely does something (it ought to click on a lot better)
– Nvidia then has their implementation of the plug soldered (one thing that’s merely not performed with this sort of energy and “movable” plugs; simply ask somebody who works within the automobile, boat or plane business)
– They clearly do not reside in the true world as most cupboards barely match with these bricks of video playing cards they produce; only for enjoyable test boards and reddit, a great deal of 4090 house owners who go away the facet panel on their case till they will get cablemod’s plug as a result of in any other case it simply will not match

The factor is certainly badly designed. The ironic factor is that Amphenol is as outdated as Molex and what we frequently name “Molex” plugs (these thick white 4-pin with +12V and +5V) are literally from Amphenol (Mate-n-lok that factor is known as). They actually know what they’re doing and none of their different plugs enable as a lot as Molex’s. All the opposite plugs in your PC even have a lot greater margins and do not enable almost as a lot energy because the plugs really can take.

So who would have pushed for present values? ;)

* you could properly see 3 +12V wires in a 6-pin, but it surely additionally has such an attachment to make it an 8-pin. Of these 2 additional pins, one is a way pin, if it isn’t related, the third +12V wire just isn’t used.

Edit: simply to be clear, the 6-pin Mini-fit should not have any lower than 288W with 3 +12V pins (the place PCI-SIG prescribes 75W and we solely use 2 +12V wires), the 8-pin with 4 + 12V pins 336W (150 in response to PCI-SIG and we solely use 3 +12 wires).

[Reactie gewijzigd door Werelds op 19 november 2022 13:11]