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setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
--scrypt -o stratum+tcp://eu.clevermining.com:3333 -u xxx -p --thread-concurrency 27400 --lookup-gap 2 --gpu-engine 880 --gpu-memclock 1250 --gpu-powertune 20 -w 512 -I 18 -g 1
...
Hi,
I would try to lower the intensity a bit. Maybe try with -I 16 as a starting point.