So stepped things up dual mining SHA and Scypt to 800Mhz, and I am getting 6.4GH/s and 340Mh/s avg per gridseed, they get mildly warm but nothing that i would be concerned about.
Anyone try dual mining under windows at 850Mhz yet, I dont want to push them too far when mining sha alongside scrypt as the sha asics can get fairly warm.
850 is about the safe limit for these in dual mode, anything above that might be too hot for the chip.