One amusing thing is that all the GPU risers I see for sale include a SATA-to-6-pin adapter cable. According to this hugely useful page on "PlayTool", the SATA port can only handle 54W through the 12V pins, whereas the PCIe spec shows the 6-pin connector as required to supply 75W.
In other words, the card could try to draw 75W through a connector only designed for 54W. Sounds like a fire waiting to happen. It's unclear how a 120W card would draw power, i.e. if a standard 6-pin is used for the riser and the adapter cable is used for the auxiliary connector, would most of the power come through the riser first?
Well, since I run close to the minimum, 60-75W for 120W cards and 90W for 150W cards, it shouldn't be a problem if 50-50, but if power is pulled through the SATA connector primarily, that wouldn't be good. I think I'll spend a few extra bucks and get the right kind of cables.
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