You can utilize the CPU more efficiently?Didn't notice anything like this. What CO has to do with FCLK?
It effect core stability at least I can confirm.
Some things I run to benchmark like the higher FCLK for better performance. But also means I can't have as aggresive Curve Optimizer settings to be stable.
More FCLK the less Negative CO settings you can run and I need Positive offset to work stable on some cores.