I will going up to 5 cards on my Gigabyte 990fx-UD5 (it doesn't have a 6pin connector like that MSI board, *nifty*)

I've read that 6 pin connectors will supply 75w while the 6+2 pin connectors will supply125w for a total of 225 watts to the card. I'm using gigabyte 9750's.. I read on the AMD site that they draw 200W a piece.

Why would I need powered risers when a LEPA G 1600w PSU will be in place? That's enough power for 5 cards and 300w to spare.