@stephenw10 et all
I've been liaising with QSFPTek.com support team and they've been very helpful and have stated the Intel branded DAC cables should work "out of the box". They provide MBR details and a 5 year repair warranty on their DAC cables, which I believe is a solid warranty option. However the proof is in the pudding... I have ordered the DAC cables and will post an update on the functionality when I can.