7 ms·

Then new M1 Pro relies on its fan to prevent throttling so I don't know about their plans to go fanless yet.

by 51Cards 6y ago

WanderPanda 6y ago
MBA is fanless, 12” has been fanless for years (until it was discontinued)
knolan 6y ago
The Air in the article is fanless.
- kube-system 6y ago
  Right, and I think some benchmarks I've seen this morning indicate that it throttles during more intensive tasks. The Pro benchmarks better, the only difference being the fan.
  - HatchedLake721 6y ago
    After 8 minutes
  - jeffbee 6y ago
    All CPUs throttle, all of the time. It's been years since anyone shipped a high-performance processor without a closed-loop dynamic thermal control system.
    - kube-system 6y ago
      Having a throttling mechanism != the throttling mechanism is engaged With enough cooling, you can operate a CPU at full tilt and never engage the throttle.
      - jeffbee 6y ago
        If your CPU always runs at its steady-state temperature that means it sucks and it leaving performance on the table. A CPU that can run at a steady 3 GHz (or whatever) should be capable of 5+ GHz momentarily given the right initial conditions.
        kube-system 6y ago
        Thermals are not the only factor that limits clock speeds. For instance, gate switching times are also a factor. Although if you're saying the M1's performance "sucks", I can't wait to see the next iteration.
        totalZero 6y ago
        You're choosing the argument first and then trying to justify it post hoc. That's the downside of having these conversations in thread format; it's easy to disagree, and tough to acknowledge that the other guy can be right about some things and wrong about others. Sure, the critical path setup and hold time limit clock speeds, but that's not the reason for throttling a chip that can turbo at a higher clock. Even if it were, certain operations with a shorter critical path could run at faster clock even when hot. If thermals weren't the dominant factor, you wouldn't need better cooling to overclock. My perspective (correct me if wrong): Hot semiconductors can damage themselves, and this becomes more important as the lithography shrinks. Binning is designed to identify which silicon can be pushed harder and which is not quite up to the task. I agree with the other guy that if your CPU always runs at its steady-state temperature that means it is leaving performance on the table.
  - stu2b50 6y ago
    But only after 10+ minutes of full load according to tests. And only after 30 minutes do you get noticeably performance drops (around 20% or so). For developers, for instance, I really doubt you're going to commonly have 30 minutes of full load in your normal workflow.
  - vimy 6y ago
    According to one reviewer it takes 8 minutes before it starts to throttle.

Then new M1 Pro relies on its fan to prevent throttling so I don't know about their plans to go fanless yet.

WanderPanda 6y ago

MBA is fanless, 12” has been fanless for years (until it was discontinued)

knolan 6y ago

The Air in the article is fanless.

kube-system 6y ago
Right, and I think some benchmarks I've seen this morning indicate that it throttles during more intensive tasks. The Pro benchmarks better, the only difference being the fan.
- HatchedLake721 6y ago
  After 8 minutes
- jeffbee 6y ago
  All CPUs throttle, all of the time. It's been years since anyone shipped a high-performance processor without a closed-loop dynamic thermal control system.
  - kube-system 6y ago
    Having a throttling mechanism != the throttling mechanism is engaged With enough cooling, you can operate a CPU at full tilt and never engage the throttle.
    - jeffbee 6y ago
      If your CPU always runs at its steady-state temperature that means it sucks and it leaving performance on the table. A CPU that can run at a steady 3 GHz (or whatever) should be capable of 5+ GHz momentarily given the right initial conditions.
      - kube-system 6y ago
        Thermals are not the only factor that limits clock speeds. For instance, gate switching times are also a factor. Although if you're saying the M1's performance "sucks", I can't wait to see the next iteration.
        totalZero 6y ago
        You're choosing the argument first and then trying to justify it post hoc. That's the downside of having these conversations in thread format; it's easy to disagree, and tough to acknowledge that the other guy can be right about some things and wrong about others. Sure, the critical path setup and hold time limit clock speeds, but that's not the reason for throttling a chip that can turbo at a higher clock. Even if it were, certain operations with a shorter critical path could run at faster clock even when hot. If thermals weren't the dominant factor, you wouldn't need better cooling to overclock. My perspective (correct me if wrong): Hot semiconductors can damage themselves, and this becomes more important as the lithography shrinks. Binning is designed to identify which silicon can be pushed harder and which is not quite up to the task. I agree with the other guy that if your CPU always runs at its steady-state temperature that means it is leaving performance on the table.
- stu2b50 6y ago
  But only after 10+ minutes of full load according to tests. And only after 30 minutes do you get noticeably performance drops (around 20% or so). For developers, for instance, I really doubt you're going to commonly have 30 minutes of full load in your normal workflow.
- vimy 6y ago
  According to one reviewer it takes 8 minutes before it starts to throttle.