Does this mean that if you OC a single core to the limit to get the best single threaded performance, you will see drops in performance when your other cores st

Does this mean that if you OC a single core to the limit to get the best single threaded performance, you will see drops in performance when your other cores start getting utilized? This is how all CPUs with some form of "Boost" work, yes. People who overclock generally lock the multiplier to avoid it. So you will tend to have this problem when you do not overclock.