The miner does not print to the console when an overclock "OC" kernel is in effect. Whatever improvement to the hash rate that results from the kernel seems minimal at best.
Miner print when selected OC kernel: "Selected OC1 solver"
When there is no OC1 kernel for card and algorithm then miner print "Selected Normal solver"
How to set OC paremeter in config files? Maybe "sample-config" needs to be updated?
Will do it in next update, example:
oc=0 1 1 0 1 1