Quote from: pm7 on July 03, 2016, 10:35:24 AM

Quote from: Caemyr on July 02, 2016, 06:24:23 PM

Now, please excuse me if this was already mentioned, as I just did a quick look at last few pages, but there is something I don't understand about this incident.

The pins burned on that pic are +3.3V/Ground (ATX 24pin, pins 2,3). How could RX 480 possibly draw so much 3.3V from PCIe to burn the ATX pin? The biggest draw measured on that line was 5W (PCper), with others pointing even lower values (2.5W during benchmark).

The burned pins are both +12V of ATX connector. I think you forget that pinouts are of the plug, not socket.
Why only +12V burned? Because there are many more pins for ground, so each had less current.

Quote from: d57heinz on July 02, 2016, 03:55:48 PM

So it can technically feed more thru the 12+ then the ground can return. Yes there is some burnt off as heat but most comes back down the return. And if that isn't the same as the 12+ then you have meltdown.

Kirchhoff's first law disagrees with this. Current incoming is always equal to current outgoing.

Quote from: d57heinz on July 02, 2016, 03:55:48 PM

Seen this many times now and that's the best I came up with as to why the 8 pin can deliver so much more and doesnt add anything more other than two more grounds and another voltage sensor.

6 pin can deliver much more power in reality. I know, I use it to power some devices from computer PSU. It's just about limiting how much power should be drained, probably because many PSU are crap.

I would also like to state that -12V is almost not used today. It may by used by audio circuit on motherboard, but it's absolutely not used with +12V to power anything heavy. See how small current is allowed (specification of the PSU). Voltage is too small to create any arc. You make some bizarre explanation to explain bizarre situation, but it was just the +12V pins that burned because of too much load.

Thank you for clearing that up for me. I appreciate you taking the time to provide a thorough explanation. I would have to agree with you after reading up on it. This brings to light a serious issue in pcie configuration does it not. Providing three positive lines while only providing 2 grounds. 75 watts gets split by a third over three but only half over the ground. Thus most likely causing the overheating. Thanks again for stearing me straight.

Best regards
D57heinz