3 ms·
Intel's TDP is just at base clock which Intel keeps at 3.7GHz. Pretty it's close to a hoax. Power increases linearly with frequency and squarely with voltage.
by xxs 7y ago
Intel's TDP is just at base clock which Intel keeps at 3.7GHz. Pretty it's close to a hoax.
Power increases linearly with frequency and squarely with voltage. Higher freq. needs higher voltage. This applies to pretty much any CPU/GPU. Also AVX loads are significantly more power hungry.
230W would be a low estimate for a fully clocked one.
- stcredzero 7y agoPower increases linearly with frequency and squarely with voltage. Going by the common use of "squarely," the power usage might also be interpreted as being linearly with voltage. Rather, I understood you meant that power increases proportional to the voltage squared. (For the lurkers: Friction increases proportional to velocity squared, as does kinetic energy. These are all quite useful things to know, and should be part of the takeaways from your basic science education.)
- xxs 7y agoOk - a fair point. "Voltage squared" fits better, indeed. It's a simplification that comes from P = V * V / R.
- whatshisface 7y agoThe word you're looking for is "quadratically."
- stcredzero 7y agoThanks for that! Now I can use parallel -ly suffixes to express that thought, too!
- xxs 7y agoTrue that, but what bothers me is that people may take it 'as 4x times increase' (quad=4, similar to twice, thrice, and so on). This is pretty much what I used to use.
- whatshisface 7y agoThat's called "quadrupling."
- verall 7y agoThat's not right - it comes from the formula of power dissipation in an asic: P=CfV^2 (power equals capactiance times frequency times voltage squared). Clearly we don't turn all the mosfets on every cycle but it's the rough idea.
- xxs 7y agoeh, c'mon; 1/R = 2πfC <- which is exactly the same. I tried to show where the voltage comes from with a well known formula. About turning on/off all fets, it doesn't matter as long as the same ones turn on in specific cycles. They just turn on/off more frequently.
- DeathArrow 7y agoIt would be interesting if someone would take an Intel CPU and an AMD CPU and calculate the electricity bill difference someone would pay in a year considering 40 hours / week run time.