Not trying to control the current flow, just making sure the bottom can feed as much as the top, all current will source the path of least resistance, seems you are quite aware
I really would like to advise you, but I have no idea what you are trying to say. If you want the bottom to have the capability to feed as much as the top(idk why because each 12v circuit in the card is isolated so the card isnt going to balance from feeds) then you would simply use the same size wire.
Only variable is the PCIE card... In a MB the PCIE wires feeding those cards do not get hot. No matter the load.
So I believe the reason the Heavy custom wires are hot, is the only difference I see and that is a custom PCIE Slot setup.
Makes no sense the 12-10 ga wire would even be warm at all. Something is off, trying to help.
6x 18 ga = more wire than 1 x 12 ga. Quite a bit more actually. In the case, or running from a power supply, you have many smaller wires, with more total cross section. I was cheating a little at 12 ga, and it is working fine, just warm
Repair guy, I measured everything. The 5v lines see very little action, I've measured .5-.7 A per card, at full hash speed. The 12v line on the riser card uses 2.7 A, at full power, on a 280x. I power those from the server psu because I use very small cheap psus in each case, just to run the mobo. I don't have the capacity for 5 x 35-40 watts extra on each board.
