2 ms·

> The idea that an Intel machine is significantly faster for 2-3 minutes after the start of a benchmark is just silly, that's not the way these things work. Go

> The idea that an Intel machine is significantly faster for 2-3 minutes after the start of a benchmark is just silly, that's not the way these things work. Go start a benchmark of your own to see. I've done so, on many occasions, with actual power meters rather than trusting software power estimates. You really do commonly see a laptop's power consumption drop significantly ~28 seconds into a multithreaded CPU benchmark. > (Obviously the cooling system could take it away, but part of your argument is that the cooling system is only good for 35W!). I make no such claim that the cooling system is limited to 35W. I only claim that the default platform power management settings from Intel impose a 35W long-term power limit, unless the system builder has adjusted the defaults to account for whatever form factor and cooling choices they've made. Perhaps you haven't realized that the turbo power limits will still kick in even if the CPU die temperature is not too hot—because they're not actually a temperature-based control mechanism?

ajross 4y ago
Uh... this is a socketed CPU: https://www.intel.com/content/www/us/en/products/sku/230498/intel-core-i913900t-processor-36m-cache-up-to-5-30-ghz/specifications.html https://www.intel.com/content/www/us/en/products/sku/230498/... Now I see where the disconnect was. You're right, if this was a laptop that could happen. It isn't, and it didn't.
- ribit 4y ago
  Even in a laptop CPUs regularly draw more power than the TDP for non-trivial amounts of time.
- wtallis 4y ago
  It's a socketed CPU intended for low-power small form factor systems and thus will usually be running with Intel-recommended power limits or lower, for all the same reasons that laptop CPUs are usually running with low power limits. The control mechanisms don't actually function any differently between their laptop and desktop CPUs, they just have different default parameters (the various turbo limits). The only relevance of the socketed nature of this part is that it is easy to put it in a normal desktop form factor where a big heatsink and possibly tweaked turbo limit settings can be used to generate misleading benchmark results. But it's not actually certain that this is what's happening; the Intel-recommended default behavior for this chip can plausibly produce the reported results—just not in any way that could be reasonably described as "35W".

ajross 4y ago

Uh... this is a socketed CPU: https://www.intel.com/content/www/us/en/products/sku/230498/intel-core-i913900t-processor-36m-cache-up-to-5-30-ghz/specifications.html https://www.intel.com/content/www/us/en/products/sku/230498/... Now I see where the disconnect was. You're right, if this was a laptop that could happen. It isn't, and it didn't.

ribit 4y ago
Even in a laptop CPUs regularly draw more power than the TDP for non-trivial amounts of time.
wtallis 4y ago
It's a socketed CPU intended for low-power small form factor systems and thus will usually be running with Intel-recommended power limits or lower, for all the same reasons that laptop CPUs are usually running with low power limits. The control mechanisms don't actually function any differently between their laptop and desktop CPUs, they just have different default parameters (the various turbo limits). The only relevance of the socketed nature of this part is that it is easy to put it in a normal desktop form factor where a big heatsink and possibly tweaked turbo limit settings can be used to generate misleading benchmark results. But it's not actually certain that this is what's happening; the Intel-recommended default behavior for this chip can plausibly produce the reported results—just not in any way that could be reasonably described as "35W".