And how much can you pull for each USB-C? Could it have anything to do with that?
Current small Macs don’t support USB-PD output or input. So they are, in fact, at the minimum specification level.
By the way, these are USB4 ports and they don’t have to provide 15 watts for each port at all, and the minimum is 7.5 watts:
The USB4 source must provide at least 7.5 watts (5V, 1.5A) per port (Section 5.3 of the USB Type-C 2.0 specification)
So that’s half of what you call it. An Ethernet port (and other peripherals as well) can get juice directly from the power supply if they transfer everything to the power source like they did with the iMac. Then it also uses this USB port handy for other things that don’t necessarily need to be connected directly to the device (like HDMI, ethernet, and a bunch of USB 2 devices.
Ultimately, you can do that easily with USB PD 100W.
Do not forget that we are talking about a device of a different configuration (with a power supply of 150 watts) that has a CPU with a TDP of 65 watts. This is just the chip itself and we’re not even talking about cooling, peripherals, power supply inefficiency, etc. The entire system with the M1 is using no more than 30W now. So including SSD cooling and I don’t know what else.
Hence, the power consumption does not necessarily decrease by 54%, but much more. 100W PD is really enough.
Edit: Just for comparison. The new iMac comes with a 143-watt adapter and is said to have a headroom of 44 watts, and that includes 40 watts of screen consumption: https://www.lifewire.com/…pter-has-a-secret-5180108
There they are also called “pass-by”:
“The only other factor is pass-through charging if you connect a device or phone.” Pass-through charging is limited to 15 watts on existing M1 Macs. In total, you can estimate these factors to be no more than 20 watts.
For the same slide:
There is a bigger increase in performance than it appears at first glance. “The eight-core M1 CPU lasted about 13 watts in our tests,” said Yurev. “The eight-core GPU peaked at 5.6 watts.” You’ll notice that these numbers are well below the maximum power consumption of the Mac mini M1.
Its maximum power consumption includes much more CPU and GPU. Mac mini’s speakers, wireless, RAM, and storage draw power. Even the M1 chip contains multiple co-processors, such as the Neural Engine.
This is why Yuryev’s estimated numbers for CPU and GPU power draw, which add up to as little as 19W, are well below the maximum power consumption of the Mac mini M1.
This tells us that future M1 chips with more cores need less power than the mathematics of napkins suggests. The theoretical M1X chip with twice the CPU and GPU cores of the current model will not double the power consumption of the Macs you use.
This is really very little.
[Reactie gewijzigd door supersnathan94 op 25 mei 2021 17:44]
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