Here's an image of the 12VHPWR cable supplied with my Thermaltake Toughpower SFX 1000W PSU taken during the build of my PC. I like how the socket pins only have one split unlike a lot of the failed connectors I see that have two splits. I of course don't know if that's even a mitigating factor.
It was quite the concern for me as I had to cram the cable in and put quite the bend on it so that it would fit. If I could get some of the new 12VHPWR connectors I'd be tempted to make my own custom cable, a really short cable!
With only millimetres to spare between the 12VHPWR cable and the fans of the radiator above it, the cable needed to be trained as such. At least it's well anchored and has no movement apart from the usual expansion and contraction of being in use.
So far there's no evidence of any burning or melting but it's the last thing you want to be concerned about when you using your computer.