Hello guys, I am thinking of ordering an Akitio thunder 2 to fit my AMD RADEON HD 7970 in to, to run with a corsair 500 watt power adapter. I will then run via thunderbolt in to my Mac. I wanted to ask, do I have to use a barrel plug, connected to the PSU, which I then plug in to the Akitio, to have the PSU powering the Akitio and GPU. Can I not just use the PSU for my graphics card, and use the given Akitio power adapter to power the Akitio thunder 2? Will it still work? I am running it off an external monitor. Thank you guys