Yep. Plenty of room for 2x GTX 690s since they're just dual slot cards.
But the PSU bay is not big enough for a 1500w PSU. The higher powered PSUs (1000w+) are usually 5.5" width x 3.4" height x 7+" length.
Normal PSUs are 5.9"(W) x 3.4"(H) x 5.5"(L)