NotCPUCores is free, open-source and performs everything (which is rather little) that CPUCores offers.

To quote the github page of NotCPUCores:
"All these "optimizers" do simple tweaks that you yourself can do, so probably not; You DEFINITELY should NOT be forced to pay money for it. You MAY see marginal returns, slightly better stability of FPS, but also more battery usage. There is SIMPLY NO REPLACEMENT for doing a hardware upgrade."

Thus, there is no real reason to buy.

NotCPUCores is free, open-source and performs everything (which is rather little) that CPUCores offers. To quote the github page of NotCPUCores: "All these "optimizers" do simple tweaks that you yourself can do, so probably not; You DEFINITELY should NOT be forced to pay money for it. You MAY see marginal returns, slightly better stability of FPS, but also more battery usage. There is SIMPLY NO REPLACEMENT for doing a hardware upgrade." Thus, there is no real reason to buy.