I've been googling for ages and I have read the "README" file at least five times but no one could I find the intensity setting K28x8 or similar actually mean.

I'm using the argument -l 28x8 but I might as well be burning my GPU right now because I have no actual idea what any of those numbers means and it is nowhere explained.

Could please, someone, explain how those numbers work so that I can use them properly on my GTX 660?

Thank you!