I looked at the pictures of the cable on newegg. The cable you get with the case is packaged with the cable completely folded over and you have to unfold the cable to use it. The pics from newegg show the cable not folded in its packaging. Would the bending of the cable cause resistance (attenuation) issues?
If you google PCI riser cable and DCP latency you will see some interesting posts from BitCoin miners about riser cables. Might be a good experiment for TT to try out with folding the cable vs. non folded cable.