The "-C" flag stands for the long form "cpu-mining" command that would be in a JSON format configuration file.
That's what the arg is called but not what it does. I had assumed it did what it said but it just uses more CPUto be more responsive to the GPU which helps the GPU hash faster. The CPU doesn't hash at all.
Why should the 2 cores in the cpu hash at all?? Bether to let the cpu aid the GPU's to reach the maximum output. -C is intelligent CPU hashing. Your miner is just HASHING
.Because it increases the overall hashrate of the rig if the CPU is powerful enough, but the priority for the CPU is to serve
the GPUs.
As someone else commented about dedicating one CPU thread per GPU, it should be noted this is more important when using -C.