181–190 of 526 posts
Earlier quoted context omitted.
If only we had connectors which could actually handle such currents. Maybe something along the lines of an XT90, but no Nvidia somehow wants to save a bit of space or weight on their huge brick of a card. I don't get it.
At these wattages just give it its own mains plug.
Is NVIDIA breaching any consumer safety laws by pumping twice the rated current through a 24ish gauge wire? Perhaps by violating their UL certification?
Aren't 12VHPWR cables like https://www.overclockers.co.uk/seasonic-pcie-5.0-12vhpwr-psu... 16AWG ? Sure, there are problems with the connector. But 600W split over a 12-pin connector is 8.3A per wire, and a 16AWG / 1.5mm² wire should handle that no problem.
What’s wild is that this is a company clearly capable of designing highly complex things with numerous tradeoffs, challenges and unknowns. And then the fuckin cable is the issue. Repeatedly.
This is because they are trying to parallel like 50amps (it's 12 volt IIRC) over a few conductors to get to 600watts. If it becomes unbalanced due to any number of reasons, none of those individual cables can come close to handling it - they will all generate enough heat to melt lots of things. Conservatively, they'd have to be 8awg each to be able to handle the full load without melting if they ended up taking the f…
If we’re going to keep up these kilowatt scale cards, we’re just going to need higher voltage rails on PSUs. I had a bunch of similar dumb power connector problems when my 4090 was new.
There is a real problem with the connector design somewhere: der8auer tested with his own RTX 5090FE and saw two of the cable strands reach concerning temperatures (>150ºC). Video timestamp: https://youtu.be/Ndmoi1s0ZaY?t=883
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I had two AMD 7900 XTX and they both overheated like mad. Instant 110°C and throttle. Opted for a refund instead of a third GPU.
Probably reference cards, yeah? I think the common advice is to not buy the reference cards. They rarely cool enough. I made that mistake with the RX 5700 XT, and will never again.
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I’m aware we have 240V outlets. They are just not used in a place where you would put a PC. Until there is a shift in need (I.e., every normal user would need more than a 120V plug could handle), you won’t ever see 240V outlets in offices. I suspect it will never happen. In server areas and extremely specialized stuff? Yea, sure. But we’re talking desktop PCs here.
There's also 20 amp circuits which are common. Many houses run circuits that are rated for 20 amps even if they don't have the right outlet for it so this is an inexpensive upgrade for most.
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Then the graphics card would have to have a transformer on it to step down to the voltage that the chips can handle.
They already do - most of the components buck the 12V down to the 1.3ish volts that the GPU core needs
Is NVIDIA breaching any consumer safety laws by pumping twice the rated current through a 24ish gauge wire? Perhaps by violating their UL certification?
Aren't 12VHPWR cables like https://www.overclockers.co.uk/seasonic-pcie-5.0-12vhpwr-psu... 16AWG ? Sure, there are problems with the connector. But 600W split over a 12-pin connector is 8.3A per wire, and a 16AWG / 1.5mm² wire should handle that no problem.
> Roman witnessed a hotspot of almost 130 degrees Celsius, spiking to over 150 degrees Celsius after just four minutes. With the help of a current clamp, one 12V wire was carrying over 22 Amperes of current, equivalent to 264W of power.