Re:AMD Threadripper 3970X under heavy AVX2 load: Defective b...
by jotm on Friday February 21, 2020 @02:08PM
(#22385811)
Intel's TurboBoost is such a marketing mess. It used to be more sane when they stated base clocks - the guaranteed frequency you pay for. Anything above was just extra performance when your CPU is not running hot/at power limits.
Nowadays it's just "up to XX GHz", and people expect it to run at those clocks.
AVX really pushes the CPU, an Intel Core/Xeon will hit the power draw limit pretty fast. They don't decrease clock speed as much as fall back to base clocks. The ones you paid for. Anything above that is just a bonus.
That said, you should never trigger PROCHOT even under full stress load with AVX! If you do, you need better cooling.
It's a last resort throttling feature for when your processor is hot enough to boil water :/
Nowadays it's just "up to XX GHz", and people expect it to run at those clocks.
AVX really pushes the CPU, an Intel Core/Xeon will hit the power draw limit pretty fast. They don't decrease clock speed as much as fall back to base clocks. The ones you paid for. Anything above that is just a bonus.
That said, you should never trigger PROCHOT even under full stress load with AVX! If you do, you need better cooling.
It's a last resort throttling feature for when your processor is hot enough to boil water :/