Re:How macOS manages M1 CPU cores
by scoopertrooper on Monday April 25, 2022 @09:01AM
(#31153865)
The 13900k will still be stuck on the current process node, so don't get your hopes up.
https://www.xda-developers.com/intel-13th-gen-raptor-lake/#i...
> On top of that, responsible use of energy is exactly where we should be heading,
I never really got this arguement, especially when you're talking about a laptop that will happily draw 40w+ if you crank the display brightness. Arguing about the merits of a 7w CPU vs a 15w one sounds like people are missing the forest for the trees.
If you sell half a million CPUs that’s a lot of megawatts.
Re:How macOS manages M1 CPU cores
by adgjlsfhk1 on Monday April 25, 2022 @09:53AM
(#31154739)
40W is way high. https://www.notebookcheck.net/Dell-XPS-15-7590-OLED-Power-Co... shows 20w for max brightness on a laptop OLED monitor (or 6W at minimum brightness). For 13 inch laptops, it's around 25% lower (less area). Also, laptop CPUs can pretty easily use 30W (i7-1185G7 is an ultrabook class CPU and can be configured up to 28W).
Edit: was your 40W for total power consumption? If so, then going from 20W cpu to 10W cpu is still a 25% energy consumption reduction (as well as a cooler lap and better battery life).
Macs have long reserved ~50w of power for the display, whether or not all of it is used is a different question. Giving them the benefit of the doubt (and accounting for screens that can max out at 1500 nits), I think an upper bound of 40w is pretty close to the actual figure. OLED will always pull less power since it doesn't need a backlight, in contrast to the hundreds of backlights on newer Macs.
Re:How macOS manages M1 CPU cores
by adgjlsfhk1 on Monday April 25, 2022 @11:26AM
(#31156207)
The macbook pro has a 70 watt hour battery, and has a 10 hour battery life (video playback). Also, if I'm reading correctly, the 1000 nits brightness is only achievable when plugged in, and apple automatically reduces brightness on battery to keep the power consumption lower.
The so-called breakdown of Dennard Scaling happened a little over 10 years ago. Since that time, CPUs have been forced to keep portions of the die powered off at any specific point in time - to prevent melting themselves. Each new generation requires a larger and larger area to be shut off.
Responsible use of energy directly leads to higher performance. You can also restate this: software is a performance bottleneck in a modern CPU.
Also if you ever owned a top end Intel MBP you'll know how much pain Intel can inflict on you.