4 ms·

AMD doesn't really have anything in this category, do they? Or even any announced plans for it?

AnthonyMouse 6y ago
Ryzen 4000 series has 8 cores down to 10W. This is 7W but with fewer and slower cores. But there are things that need lower power more than multi-thread performance.
- ihattendorf 6y ago
  They really aren't comparable. For example, standby power for Lakefield appears to be 2.5mW. Idle is probably significantly lower as well. They're targeting different use cases.
  - AnthonyMouse 6y ago
    I can't find any figures for the standby power for Ryzen 4000 series, but standby is basically off. The standby power consumption should be negligible in both cases. It's also not obvious what that use case would be. You can put most laptops into standby and they'll run on battery like that for many weeks. What's the thing that needs more than that? It would be interesting to compare idle power consumption, but for that we'd have to know what it actually is.
    - londons_explore 6y ago
      Also, don't most x86 CPU's support being powered off entirely during standby? Ie. flush the caches, write the registers back to RAM, set RAM to self-refresh, and then write some config registers in some power control IC to cut the power to the CPU. Then it doesn't matter what the standby power consumption is - it simply matters how quickly it can get back into a working state from OFF.
dr_zoidberg 6y ago
That'd be the "Banded Kestrel" processors. Wiki: https://en.wikipedia.org/wiki/List_of_AMD_accelerated_processing_units#R1000-Family:_%22Banded_Kestrel%22_(2019,_SoC) https://en.wikipedia.org/wiki/List_of_AMD_accelerated_proces... CPU-World: http://www.cpu-world.com/CPUs/Zen/AMD-Ryzen%20Embedded%20R1000%20R1102G.html http://www.cpu-world.com/CPUs/Zen/AMD-Ryzen%20Embedded%20R10... However those are Zen+ fabricated on 14nm, so not really the best that AMD could do in this area. They could fight either with a slowed down Renoir (that could meet the TDP requirements while not requiring any development) or a specific processor based on Zen2.

Ryzen 4000 series has 8 cores down to 10W. This is 7W but with fewer and slower cores. But there are things that need lower power more than multi-thread performance.

ihattendorf 6y ago
They really aren't comparable. For example, standby power for Lakefield appears to be 2.5mW. Idle is probably significantly lower as well. They're targeting different use cases.
- AnthonyMouse 6y ago
  I can't find any figures for the standby power for Ryzen 4000 series, but standby is basically off. The standby power consumption should be negligible in both cases. It's also not obvious what that use case would be. You can put most laptops into standby and they'll run on battery like that for many weeks. What's the thing that needs more than that? It would be interesting to compare idle power consumption, but for that we'd have to know what it actually is.
  - londons_explore 6y ago
    Also, don't most x86 CPU's support being powered off entirely during standby? Ie. flush the caches, write the registers back to RAM, set RAM to self-refresh, and then write some config registers in some power control IC to cut the power to the CPU. Then it doesn't matter what the standby power consumption is - it simply matters how quickly it can get back into a working state from OFF.

dr_zoidberg 6y ago

That'd be the "Banded Kestrel" processors. Wiki: https://en.wikipedia.org/wiki/List_of_AMD_accelerated_processing_units#R1000-Family:_%22Banded_Kestrel%22_(2019,_SoC) https://en.wikipedia.org/wiki/List_of_AMD_accelerated_proces... CPU-World: http://www.cpu-world.com/CPUs/Zen/AMD-Ryzen%20Embedded%20R1000%20R1102G.html http://www.cpu-world.com/CPUs/Zen/AMD-Ryzen%20Embedded%20R10... However those are Zen+ fabricated on 14nm, so not really the best that AMD could do in this area. They could fight either with a slowed down Renoir (that could meet the TDP requirements while not requiring any development) or a specific processor based on Zen2.