Thought I'd make a useful first post:
"failover-only" : true,
"intensity" : "18,18",
"worksize" : "256,256",
"kernel" : "scrypt,scrypt",
"lookup-gap" : "2,0",
"thread-concurrency" : "24550,3200",
"gpu-fan" : "68,50",
"gpu-engine" : "1000,850",
"gpu-memclock" : "1500,1350",
"gpu-powertune" : "20,0",
"temp-cutoff" : "95,80",
"temp-overheat" : "93,75",
"temp-target" : "92,70",
"api-mcast-port" : "4028",
"api-port" : "4028",
"gpu-threads" : "1",
"log" : "5",
"scrypt" : true
Also ensure you execute the following once before you run cgminer:
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100