Originally Posted by looniam
how many times do you need told that is wrong?
Are you just ignorant of the actual mechanical facts about the PCIe connectors? PCIe power connectors are Molex type connectors.
#1 Molex pins - these pins are rated for 6A each under normal load. This is why older motherboards used multiple pins - too much draw on a single one would overload it and burn the pin. This engineering standard HAS NOT CHANGED IN THIRTY YEARS. While "capable" of 8 amps, it's not advisable to run them higher than 6. The spec for PCIE allows for about 3.35A per pin but they'll carry 6A each all day long without getting hot at 12V.
You see how it has the note in there "Official spec lists 'no connection' about pin 2 on the 6pin connector? Where it is commonly supplied with 12v the same as the other two? Like 93% of supplies power this pin. The way to tell if your supply DOESN'T power that pin is if there's no wire going into it's connection.
On a 6+2 connector the extra 2 pins are a duplicate ground and a duplicate of the first sense line... or more commonly they're just both grounds
This piece of garbage joke 8( with a jumper across the +2 component.
So... while you may have heard something different: 6pin PCIe cable is 3-hot 3-not and an 8pin PCIe is 3-hot 6-not providing extra grounding to deal with sudden shifts in power on the card causing a need to dissipate the charged state of the components and ensuring the non-energized surface contact of the grounding exceeds the needs of the power draw.
When you're dealing with slip connectors you want the grounding connection to have MORE surface area than the power feed connection - its why the ground connection on a 3 wire plug almost always has a larger surface area in contact in much of the world. Ground fault equipment reduces this need somewhat...
So basically, I know the mechanical facts about the PCIe auxiliary molex 6 pin, 8 pin and 6+2 pin connectors. And the twin-end 6+2 cables as well.It is entirely plausible that the RX480 is trying to draw power from the #2 pin but the failures are occurring on supplies that don't have it connected.Edited by prjindigo - 7/1/16 at 5:19pm