Awesome! Thanks for the info guys 
Then the 1600W is almost at its limit now with ~70W until it gets to 80%.
If the mobo uses about 60W, then I'm looking at about 190W per card including risers. 190 * 6 = 1140
80% on a 1300W is 1040W (1600's are almost impossible to get ahold of).
Could probably move a few risers over to the 1600W and then both would be pretty much at 80-81%.
Then the 1600W is almost at its limit now with ~70W until it gets to 80%.
If the mobo uses about 60W, then I'm looking at about 190W per card including risers. 190 * 6 = 1140
80% on a 1300W is 1040W (1600's are almost impossible to get ahold of).
Could probably move a few risers over to the 1600W and then both would be pretty much at 80-81%.