how many cards can you stick into the splitters - its has 3 slots - did you use all three?
Yes, I used all three slots. I have 6 risers plugged into 6 PCIe slots on the board, the 1 to 3 splitter plugged into the 7th PCIe slot, and 3 risers plugged into the splitter. Note that the 1 to 3 splitter is powered, I believe it has a Molex connector.
Crap I don't believe mine is powered which will, in my experience with this bleeding edge hardware, will cause issues..