I'm just running a single 5770 a second will be purchased shortly. Windows 7 64bit and i'm using the latsetst 10.3 drivers.
I'm happy to say now that it is not my hardware as the DP screen has not gone to sleep since upping the lower core rate for 2D as described in the link.
I do still have the black tearing lines from time to time, but that is far less annoying than a screen going to sleep.
P.S. I didn't flash my card like some in that thread go on about, i just followed the CCC profile instructions and it fixed my " 3rd monitor always falling asleep" problem. My machine was not crashing.
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