Tables? You meant Cables, right?

*just in case we might misunderstand each-other*
The problem with rounded cables is that they tend to easily break, causing transfer speed to be incorrect. I heared about interference too, but I can't site/find any credible source for this.
But I don't understand why someone who tests a lot of hardware would use rounded cables, unless it's your

production system.
However I have realy bad experience with rounded cables in terms of quality;
1) They break
2) Plugging/ unplugging these things are a bitch
3) They do not bend that well (got better airflow results with flat ones, if done right)
I don't know... It's never advised to use these things by anyone I have spoken and I have realy bad experiences with the physical quality of these things.