How are you getting 21 cards to work on a motherboard that has 19 PCIE slots?  Using some kind of spliter?  If so, what kind?

How long does it take the system to boot? 

Would any you that have gotten 19 or even the elusive 21 cards to work post the products you use in order to get it to work?

I'd love to build a 19 GPU monster, but have been having trouble with trying to get more than 4 GPUs to work on the biostar 12 GPU motherboard.

Thanks.