He is talking about PCIe Splitters, i.e., a PCIe x16 to 3 PCIe x1 splitter. The example post was in Pics of your mining rig. The guy was trying to hook 6x5870 on once board with x16 to 3-x1 splitter. He didn't manage to get it too work instead just went with 2 motherboards with 3 cards each.
Thanks, I'll do some reading of that thread. Do you know if it was specifically the splitter he was having problems with? in the post I was thinking of, the guy did have it working, so maybe it was different?
Certainly increases the possibilities if you could split up each slot into multiple cards. Otherwise it's just extender cables, though it doesn't look like I can get them locally at all, Aus, so have to wait weeks on delivery 8(