...
GPU 2: sieve size = 550556388001 (7 bits)
GPU 2: max bits used 341/352
Connecting to frontend: 54.187.143.168:6666 ...
Connecting to bitcoin: 54.187.143.168:60002 ...
Connecting to signals: 54.187.143.168:60003 ...
Work received: height=529506 diff=10.890167 latency=760ms
error: ProbablePrimeChainTestFast 0/4

I have win7, 13.2 driver and I clocked both mem and core to 1000. 280x. Restart and still same error. I know newer driver should be installed but I got the same software setup on other rigs and it works fine.