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Recent content by Tsumi

  1. Tsumi

    RTX 5090 FE Molten 12VHPWR

    Yeah, you're right. From the reddit post: Theoretically, he could do the same thing using a 12v-2x6 connector instead of two 8 pins, if his power supply had two 12v-2x6 outputs. He's basically soldering a second header onto the original header. Edit: Some quite dubious claims from the Reddit...
  2. Tsumi

    RTX 5090 FE Molten 12VHPWR

    It's still all being fed to a single header on the GPU itself, so I doubt that this fixes the core issue of current imbalance on the pins. The wires were never the problem; the header is.
  3. Tsumi

    RTX 5090 FE Molten 12VHPWR

    Cool. So out of 10? 4090/5090 owners in this thread, 1 had a blow up, and 1 managed to catch a blow up before it occurred. A 20% failure rate seems unacceptably high to me, but what do I know.
  4. Tsumi

    Seasonic Vertex PX-1200 just blew up

    No smoke means it's unlikely to be a capacitor. A resistor or mosfet blew up? You would only get damage if something short circuited and sent voltage where it wasn't supposed to go. Generally unlikely with most well built PSUs.
  5. Tsumi

    Cases with PSU mount in front?

    Azza Genesis 9000. Not in production anymore as far as I know. Full tower case that can fit a 480mm radiator on the top and 280 radiator on the bottom with a small-ish PSU in the front.
  6. Tsumi

    RTX 5090 FE Molten 12VHPWR

    Yes, not running the connector so close to its limits will reduce the number of incidents. Separating the pins does not fix the margin issue but it does fix the fact that you can catch a problem before damage occurs. I'm not sure how much clearer I can make it. You monitor the voltage of each...
  7. Tsumi

    RTX 5090 FE Molten 12VHPWR

    I ran a couple of simulations to illustrate: With all connectors having a resistance of 0.01 ohms, about 0.69 watts is being generated in each pin at 600 watts with a voltage drop of 0.083 volts. Total heat being generated is about 4.14 watts. Let's use that as the baseline and run through some...
  8. Tsumi

    RTX 5090 FE Molten 12VHPWR

    We want this because it immediately indicates a problem via a significant voltage drop after the pin that can be easily detected. It also limits the amount of current going through the pin, thus limiting how hot it can actually get. Tying all the pins together masks the problem until the...
  9. Tsumi

    RTX 5090 FE Molten 12VHPWR

    To answer your questions: Each pin has a maximum current they can handle. If there is any difference in resistance between the pins, the current carried by each pin will become unbalanced (some pins will carry more than others). In the case of the PCI-E connectors, each pin has so much headroom...
  10. Tsumi

    RTX 5090 FE Molten 12VHPWR

    Don't be disingenuous- the focus has been on these connectors being run too close to their rated limits with no protection. Obviously cards with much lower power limits are several orders of magnitudes less likely to run into these problems.
  11. Tsumi

    Data center in Space

    A genius inventor, or a genius at manipulating people and the system to his advantage?
  12. Tsumi

    RTX 5090 FE Molten 12VHPWR

    You only need to design it once for each GPU. And really, it only matters for the high power GPUs- the lower power ones have enough safety margin that splitting it absolutely evenly isn't a big concern. Or are you telling me nVidia doesn't have enough engineering resources to spare for their...
  13. Tsumi

    RTX 5090 FE Molten 12VHPWR

    What you're not understanding is how the power delivery system works. It's not constant power like you're assuming. Source: https://eureka.patsnap.com/article/multi-phase-vrms-powering-modern-cpus-and-gpus In any case, a VRM can only step down voltage; it cannot increase voltage as your...
  14. Tsumi

    RTX 5090 FE Molten 12VHPWR

    You're missing the point and also missing how these things work in reality. A combined bus hides marginal pins, slowly overloading the good ones until you have a burning connector. The VRMs have a limit on how much current they can supply, so your separate bad pin scenario will never happen...
  15. Tsumi

    RTX 5090 FE Molten 12VHPWR

    If you have a marginal connection where the VRM is pulling more amps than the pin can handle, the card should throttle or shut down before it damages the connector. This would be simple enough to do- if the voltage before the VRM drops below a preset value, throttle or shut down the card. Per...
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