Der8auer shows GeForce RTX 5090 FE cables with uneven power distribution, finds 150°C hotspot
Article is a summary of der8auer's video. Measurements show 22A/260 watts – nearly half of the card's power draw – going through a single wire heating it up to 150 °C in an open-air test bench.
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Time for a large busbar connecting the power supply, motherboard, and graphics card?
A 48V rail would make more sense. Just like USB-C did to get 240W power delivery over a small cable.
There wasn't even anything wrong with the minifit jr 8 pin pcie connectors, the official spec of 150W massively derated. If Nvidia really wanted to cap the number of plugs and not change any specs then the 8 pin EPS connectors are rated at 288W.
If they did that then they likely would end up with melted 8 pin connectors as that derating is a protection against one pin being overused due to small expected differences in resistance on each pin
I'm not saying to ignore the derating, I'm saying use EPS connectors at their derated 288W.
Using custom cables even in that scenario would still lead to cables melting.
It’s from increasing the cable length and therefore the required power draw to draw the required amount to power the device. It already happens with 8pin systems as well, this isn’t unique to the delivery system either.
Using too many extension cords has the exact same affect… it’s like blaming the heater because the cords melted. But no, let’s not blame physics, let’s blame the GPU(heater) -.-
Now you're really showing how uniformed you are. It's not an extension cable, it's 20cm in length total which is significantly shorter than what comes with standard 12Vhpwr native PSUs at 60-70cm.
Did you watch the video?
Sure they did...had their eyes crossed, fingers in ears yelling:
AHHHHHHLALALALALALALALAALLALALAAALLALALALAIIIIIIIIIIMNOTLIIIIIIISTENINNNNNG!
Case is ground, and one big +12V pipe through the middle. Or, alternatively, the other way around for theft protection.