I wonder if this is such a widespread issue - frequency attacks mean the cpu must actually change speed frequently in order for any attack to occur.

For a laptop how I thought it worked was cpu frequently was constant depending on performance level - so cpu should shift from low to high depending on idle state...

For a server trying to aggressively save power, frequently changing speed per operation could leak this information.

Turbo boost I thought was a setting overlong periods of time to change power levels, if you change too frequently you don't actually save much power.