Running crossfire GPU with pigtail cables?

[Revvvhead]

I've just bought some of the corsair sleeved cables for my RM1000.
What I want to know is, if running two GPUs can I use the 2 pigtail cables to run 2 GPU's with an 8pin and 6 pin PCie on each.
Or would that put too much load on the PSU or the cables?
Am I better off using an individual cable for each PCIe connection?

[Pob255]

Well as I've no idea to what you mean by "pigtail cable" your question is unanswerable.

[Revvvhead]

Its the PCIe cable with a 6+2 pin connection with another 6+2 pin connection on an extension coming out of the first one.
So 2 x 6+2 pin PCIe connectors both powered by one outlet from the PSU.

Pigtail cable is Corsairs name for it.

[Pob255]

ahh I see now.
using individual cables would probably be best, however using one pigtail cable per card should be ok.