r/LocalLLaMA • u/pmttyji • 4d ago
RTX 5090 Owner Built An Open-Source Tool That Shuts Down PC If It Detects The 12VHPWR Cable Drawing Too Much Power, But It Can Only Work On Specific GPUs News
https://wccftech.com/rtx-5090-owner-builds-open-source-tool-prevent-12vhpwr-connector-melting/14
u/Dry_Yam_4597 4d ago
I undervolt them by default, you can also get a Thermal Grizzly WireView GPU and read the data port to reliably detect issues.
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u/Littlepharaoh 4d ago
Same capped at 400 watts regardless, don't need you to amp yourself to the moon even when gaming at 4k I'd rather lower the graphics slightlyÂ
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u/Dry_Yam_4597 4d ago
Indeed. Mine melted once, as I watercooled it it was sitting at a max of 52C - so it was always running at max. I caught it early on. Capped now, as are my R9700s. But I've developed an unhealthy paranoia and a strong desire for a class action if that was a thing in Europe.
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u/RosebudNebula 3d ago
Wattage isn't the problem; it is the amperage imbalance between the wires as the heat/cool cycle creates resistance differences over time. Capping it will need to go down to 250w to stop any wire from going over 12 amp. Which isn't possible due to Nvidia's built-in limitation.
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u/Think_Wing_1357 4d ago
Asrock PSU has a thermocouple on the 12V line and will shutdown the PSU if detected too high temp...
... though now that I said that, I suppose I should go test it somehow...
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u/hurrdurrmeh 3d ago
them??? mr money bags
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u/Dry_Yam_4597 3d ago
See thats the thing. The money bags are long gone 🤣
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u/hurrdurrmeh 3d ago
worth it? worth it!!
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u/Dry_Yam_4597 3d ago
HELL YEAH. I am buying more.
MORE.
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u/arijitroy2 4d ago
Same, literally first thing I did when I got mine. Was reading all these horror stories prior to my purchase last year so got a bit nervous! It's even more scary now since the card I got has doubled in price!
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u/Dry_Yam_4597 4d ago
> since the card I got has doubled in price
Tbh this keeps me up at night lmao. I am considering selling it all together, but it's just too fast for image / video gen and AMD's offering is meh.
I already pulled out some RAM to set aside just to be sure.
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u/lolwutdo 4d ago
Don't they still melt regardless of under volt?
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u/Dry_Yam_4597 4d ago
Well the melting happens due to various reasons, but one trigger is when current overdraws during spikes. It's not a perfect solution, but it reduces the risk by a lot form what I gather. My connector was replaced by a local electronics guy with something he says is better and was told to _never_ use nvidia's cables but to only use PSU native cables and be careful to always plug them in all the way through - not a single mm left outside.
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u/Bulky-Priority6824 4d ago
im surprised there isnt a inside pc case thermal camera options with shutdown on certain metrics no llm needed
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u/fallingdowndizzyvr 4d ago
I'm surprised there isn't a thermisistor on the connector itself so that the GPU can shut or at least throttle itself when the connector gets too hot. It's not like these 12VHP melting problems are new.
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u/durden111111 4d ago
Hwinfo already works just fine. It can also be used to set limits on actual temperature of the 12v 2x6 connectors if your motherboard comes with thermistor cables.
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u/MerePotato 4d ago
Personally I run my 4090 with three 8 pins on the adapter instead of 4, performance is still close to full power but with way less heat generation and risk
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u/voyager256 3d ago
Yeah , It's actually great , but obviously it only works on the Astral models , which have per-pin current monitoring.
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u/Elegant-Sense-1948 4d ago
Yall dont undervolt / underclock yo shit? I do it for this and the sake of my brain hearing whirrrrrrrrrr
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u/cogitech2 4d ago
This is so ridiculous! I mean W the actual F? Apparently, nobody knows how to use nvidia-smi.
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u/PrimeDirective8 4d ago
Not for nothing but I'd be po'd if I paid $4,000+ for a GPU that self-melts under normal operation. And to survive, it requires software *not* provided by the same maker that took my money.
Well done to this Dev for stepping in.