Can the GPU and associated riser be powered from a single PCI-E lead off the PSU, with a splitter at the end? Or do you need to run an independent PCI-E cable for the riser? My GPUs would be power limited to 125W which should be within the rating for the 16AWG cable.
Thanks.
The splitter cables and single 16awg PCIe cable are more than sufficient to power a single riser and GPU together, that is the way these packages are designed to be setup. The PCIe cables are rated and have been tested to over 250W, and the splitters are made of 18awg cable for each circuit, so there are no concerns about power draw from GPU's at this time.