The cables could be capable of enough amperage for them not to warm up. And as we found out with the RX 480 launch power draw fiasco, motherboards don't have fuses or anything to prevent overdraw from the PCIe slot.I would have thought I'd feel the cable get warm if it was doing that. 1080ti can't exclusively draw power from the PCIe connectors if it doesn't get enough power from the motherboard does it ?
Wow, that performance is really quite impressive...On a positive note ...
I got Bifurcation and SLI working on the Asrock Z270 ITX/ac variant too
It was a little harder than the x370 Asrock ITX/ac board, but it works without a hitch.
I researched this a little when I was looking at risers.Toms Hardware's testing of the 1080Ti showed it drawing 40W-50W at from the PCIe slot 12V line under non-overclocked max load use.
This is basically the case. Few if any (I am not aware of any, but it's possible one was made in the past) GPUs have any switching circuitry to choose which power phase is connected to which 12V supply rail, and adding 'optional' power phases - e.g. have a phase connected to the card-edge, and a phase connected to the PEG connectors, and only use one at a time - is a waste of components and thus money down the drain.If there is some circuitry in the graphics card which relies on power draw from the PCI slot only, which can't otherwise be alleviated from the 6/8-pin connector.
I figured it was something like that. Risers are fairly common and I figure GPU manufacturers know they may not want to pull a full load through it. Surprised we haven't stumbled on a specification standard. Anyone have a contact at one of the engineering departments for the partner companies?I really don't know, but could it be something as simple as electrical resistance? I noticed my Sintech riser has resistors near the power pins.