this might
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182305&cm_re=psu_700w-_-17-182-305-_-Productbut not sure. has 672 + 672 = 1344 watts single rail on each psu. each psu has 3 cables use 1 full one on two boards split the 3rd cable on the same 2 boards.
all draws off the one rail and load should balance. the 3 cables will be doing 600-650 watts for 2 boards it may work.
if this works it is 69+69 = 138 usd may be a good choice cheaper then a evga 1300
see photo:

yours is a no no
the 4 rail system makes it very hard to balance the loads. also max watts if you can balance the loads is 636 + 636 = 1272 watts that is the most optimistic number
see photo:
