Originally Posted by Eroticus
This power is still going through the motherboard.
There is even Two and Four way servers with Tons of slots.
Neither point has anything to do with my points.
The board traces aren't likely to be the point of failure. Workstation/server board with tons of PCI-E slots don't power them all from an ATX 24-pin connector and parts used in these systems are generally held to tighter tolerances than consumer parts.
A consumer board with no supplemental PCI-E power could quite easily be damaged by long periods of significantly out of spec current demands from PCI-E cards.
Originally Posted by CynicalUnicorn
But even that isn't a huge deal because these wires can take quite a bit more current safely than they're rated for.
I've never see PSU wires fail, but I have certainly seen the connectors themselves fail.
In an ideal world the pin mating is always perfect and the connectors would never wear out, but this is not the case in the real world. A less than perfect connection can cause the actual contacts themselves to get hot enough to cause problems...and at well below 6A of current.
That was with a new PSU (and new cables), on a relatively new board, with no signs of power issues until hours prior to the system refusing to POST. The wires themselves were fine (I cut the ends off and tested them, they can carry a good 8A each before getting noticeably warmer than ambient, and I ended up reusing them).
The ~5A per connector I was pulling was enough to melt the plastic around the connector and fuse it to the board. That layer of plastic also worsened any remaining connection, causing more heating, which essentially killed the board. Two pins are now completely coated with a thin layer of burnt plastic and one managed to partially desolder itself. The PCB looks mostly undamaged and if I replace the pins, I might be able to salvage something, but I have yet to try.Edited by Blameless - 7/4/16 at 6:15am