It has only 1 cable with 2 branches.
My initial idea was to use the 8 pin CPU connector with an extension, where I cut the cables at one end and just plug them in the board connector, but something went really bad there.
Now I have connected both branches of the same PCI-E cable and all seems to be working just fine - I was measuring temps with an IR thermometer for like 20 minutes.
Obviously I would prefer to use the CPU cable, but I would not risk it with these cheap quality extension cables.
Now I have to find a way to use it.
I've been using 2 cx600s with 2 ants for about 4 days now. I have been using the supplied PCI connector without issue. I know this isn't recommend. I check the cables with an ir thermometer at random intervals They haven't been hot at all. My ax860 will arrive on Wednesday.