Am I reading this corect, that he did the tests exclusively with the aftermarket cable the customer provided? No resistance measurements on the cable itself but he concludes its not the cable because the manufacturer is usually reliable? No different cables for comparison?
I think I will have to watch the video later to get a an idea on the testing method, since what I can gather from the article, the testing setup Was completely useless to determine whats at fault here.
Another video noted that previous generations used multiple isolated shunt resistors to feed sets of VRM phases. The current measurements in these shunts was used to balance the current in the phases. If any shunt showed no current (connector or pins unplugged) the GPU wouldnt even turn on. Previous generations would do ridiculous things to ensure proper current balance in the wires.
This is done with 6 12V wires on the 30 series. Pairs of wires go to a shunt so there are 3 shunts, which each feed maybe 4 phases. In the worst case scenario, you could somehow lose half the wires, 1 from each pair, and the GPU wouldnt notice. This would result in up to 2x overload on any individual wire. This is why the 30 series did not burn like the 40 and 50 series.
The 4090/5090 short all of the pins together before going through 1/2 shunts, then are shorted again after the shunts. This means no individual or pair of pin currents are measured, and you can cut 5/6 of the wires and have it still think theres a good connection. This results in up to a 6x overload on a wire (e.g. all 600W going through 1 wire).
That’s the impression I got, that the power Inputs are parrarel on the card. Doesnt it mean the culprit would most definitely be indeed the cable or the pin connection between cable and card?
It could be in part either, but its also a factor of how the card itself balances the power. This will be a problem regardless of who made the cable or how perfect it is
Nope he examined the damaged aftermarket cable to see if it was faulty but found nothing obviously faulty. The heated wire was with his own PSU Gpu and stock cables.
Am I reading this corect, that he did the tests exclusively with the aftermarket cable the customer provided? No resistance measurements on the cable itself but he concludes its not the cable because the manufacturer is usually reliable? No different cables for comparison?
I think I will have to watch the video later to get a an idea on the testing method, since what I can gather from the article, the testing setup Was completely useless to determine whats at fault here.
Another video noted that previous generations used multiple isolated shunt resistors to feed sets of VRM phases. The current measurements in these shunts was used to balance the current in the phases. If any shunt showed no current (connector or pins unplugged) the GPU wouldnt even turn on. Previous generations would do ridiculous things to ensure proper current balance in the wires.
This is done with 6 12V wires on the 30 series. Pairs of wires go to a shunt so there are 3 shunts, which each feed maybe 4 phases. In the worst case scenario, you could somehow lose half the wires, 1 from each pair, and the GPU wouldnt notice. This would result in up to 2x overload on any individual wire. This is why the 30 series did not burn like the 40 and 50 series.
The 4090/5090 short all of the pins together before going through 1/2 shunts, then are shorted again after the shunts. This means no individual or pair of pin currents are measured, and you can cut 5/6 of the wires and have it still think theres a good connection. This results in up to a 6x overload on a wire (e.g. all 600W going through 1 wire).
Also sub in cut wire for bad connection on a pin.
This is a design issue with the board at minimum.
That’s the impression I got, that the power Inputs are parrarel on the card. Doesnt it mean the culprit would most definitely be indeed the cable or the pin connection between cable and card?
It could be in part either, but its also a factor of how the card itself balances the power. This will be a problem regardless of who made the cable or how perfect it is
Nope he examined the damaged aftermarket cable to see if it was faulty but found nothing obviously faulty. The heated wire was with his own PSU Gpu and stock cables.