Yup. Unless you're using the voltage / frequency curve to overclock the card...and even then, you'll still see it a little bit once temps start bumping up a little bit. I've seen voltage / frequency changes with the GPU core temp as low as 24c. Hard to verify any lower temps, as the stock voltage isn't enough once the temps get that low, to push the clocks high enough to hit another "temp layer". They happen about every 10c or so.