Those are double molex too. Not what I want.
I'll take my chances. I underclock and undervolt anyways. Couldnt be much more than 50w per pci-e going through the molex anyways.
The worst heat I got was on my backup 600w PSU (old, only has 20 pin atx, and old 6 pin 3.3v mobo connectors. had 336w available on 12v, single rail) with no pci-e power plugs. I populated all the molex with pci-e power adapters, and they werent warm, however the ground wires on the psu's molex lines were rather warm, though not quite hot. The adapters were fine. The wires on the psu molex arent quite as thick as my and a good deal longer newer psu's, probably why it got warm.
Besides, I've been using 10 of the single molex > pci-e power adapters for about 9 months now, no problems at all. They came with my sapphire 5830 extremes when they were on newegg for $130. I love them.