After 2 week or so with my new MBP 16" (i9/5500), and reading up on related topics elsewhere (plus following the thread):
- Having 12"/13" models since 2004, I underestimated what power is packed into the 16".
It's 100W against 25W (very roughly, numbers slightly rounded), like a small mobile workstation. Hence it's totally okay to need a big cooling system and will get loud/hot, when drawing on those 100W in a slim package.
(I mean: really using it for extended heavy duty compute jobs, CPU and/or GPU.)
- When using it mobile (just the device, without power or anything attached) and running on Intel-GPU, it seems to be pretty fine - cool and long running. (With the limited experience I got.)
- The fact, that the 5500 is always on when docked to my LG 5K (1st gen) is a bit disappointing. But at 5-6 W (dGPU only) for 5K resolution via Thunderbolt (at clamshell mode), while it's connected to power, I think this is okayish.
- I just have to decide, whether to fully clamshell or keep it slightly open. Slightly open seems to be cooler for the front-part but looks a bit weird.
- Fun fact: I today replaced the LG 5K TB3 cable (2.0m) with a shorter one (0.8m). I still need a bit more use, but it seems the 0.8m ("passive", shorter connector) cable runs cooler at the plug than the longer one (longer connectors, read it's "active" to get signals across the longer distance).
Trying this mostly for fun.
- The 16W+ (dGPU only) when running the 5K display and open MBP is really disappointing. That's about 10W warming the system, which could eventually hit throttling at full power, warms up the whole machine (it's warmer than in clamshell, you would expect the open lid to help radiate heat), and heat in general is not good for battery and stuff. (I'm not so much worried about the CPU/GPU, they are built for this. Unless listening to issues a colleague had with an old MBP15", where the then-time GPU "unsoldered" itself repeatedly - let's hope the cooling system is good enough for this.)
To the point, that it seems some wrong design / driver / … something.
- That being said, even with this mode at "idle" situation, system is totally quiet.
Okay, it's been nice 18-25°C these 2 weeks; might change, if surrounding temperature get >30°.
So, not "hot & noisy" for me; at least in idle state. ("Warmer than expected" - yes.)
- What surprised me when reading up, but makes sense along the trands the last years: the Core iX-somethingH processors have a TDP of 45W (compared to around 25W on the faster 13"). So I thought, CPU-only load would load the system maybe half with thermal waste, with the rest being free for GPU, SSD, Thunderbolt controllers, and what not…
What I forgot was, that in the race for single-thread performance the CPUs have learned to boost single (or: few) cores extremely high, using high voltage and power for this, overreaching their TDP power for 30s or so by factor 1.5 or more. (That's by design: modern Intel CPUs try to consume their power limits as much as possible with single- or multi-thread applications. And the 1st power limit is often already beyong TDP; not to mention the 2nd limit for the super-duper-mega-burst behavior. Which is measured in many seconds, not mili-seconds or so.)
Hence even a single thread can push power (=heat) at least during maximum turbo time extremely.
- BTW - the 10th gen Core-i for H-versions and desktops (which could upgrade the 16") are even worse than 9th gen. Still 14nm, still same architecture, even higher turbo frequency and hugely increased power usage/limits, at least on the desktops.
(The 13" Air and 13"-4-port MBP are the only ones with 10nm CPUs so far.)
- (And waiting for 11th Gen means waiting for 2021+.)
- Hence I think all the turbo-limiting and power-limit setting tools do make sense.
Though disabling turbo completely is extreme - but limiting the higher states makes definit sense.
For certain usage - e.g. optimize power consumption on the move or even preventing the system from throttling. (And of course Apple does not build-in such control features; it's too advanced for their users. )
It's sad, that people (have to) resort to this, to limit the noise leve. (On low/medium usage.)
- Just today read an article on undervolting (which Apple prevents us as well…?), where optimized voltage saved energy and made a task finish faster (!), due to the system sustaining higher frequencies due to cooler CPU.
On top, disabling the highest turbo rate (e.g. 5.3 GHz down to 4.9 GHz on a i9-10th gen desktop) further improved power saving significantly.
- Of course, all this does not show in very short-lived benchmarks, which are typically used to "compare" systems.
For these benchmarks, the "burn as much as you can" logic matches perfectly to show a "good system".
- In combination with power-hungry GPU, it makes sense Apple used the 15"/16" change to increase termal budget for the MBP to leverage more from the chips deployed.
(And going to the limits of USB-C power delivery and what battery size can be included if you still want to travel via plane. Likely also to the limit of what heat you want in such a slim case.)
- What also surprised me was a video from a German shop advertising "cooling system refresh maintenance".
Targeting July month for a special offer on their service. (Of course they want to sell…)
However, they treated a 13" and 15" MBP with cleaning and renewed/"improved" paste - and claim to a) cool them down by 10°C / 15-20°C respectively, b) make them obviously less noisy, and c) faster, due to avoided throttling.
- While I would expect some quality control from Apple at manufacturing on new systems (hence it "should" not be varying much on new sytems):
Maybe a 2nd factor when people compage here their new sytems and their temperatur:
What's the surrounding air temperature (and the surface it sits on: does it transport heat or not)? - At least, this parameter you know and can measure.
And which individual chip did it get, and how well are the "connections"? (And how to find out?)
(Next to all the: what SW is installed and running in the background, and what do people consider "idle".)
- So, my conclusion:
- I'll keep the system; maybe someone does something to driver some day; if not, I'll survive.
(I won't need "maximum power" often / as a critical feature.)
- If the system degrades the coming years, I might ask those people from that shop for a checkup.
- I hope, future summers won't be as hot as the last 2-3 hereabout. (This year isn't yet.)
Even then, here in Germany >30°C is still "rare" - I guess the sytem will be much more challanged e.g. in Madrid during summer time without air conditioning…
Any aspects I've missed? 😇
(Aside from the debate, on whether Apple can do something and will/won't, and what the best course of action is: buying even more expensive systems due to better behavior, or selling off and going elsewhere (desktop or PCs), or just wait for the ARM-systems, or just live with it, or tweak until you're happy - this is for everybody to decide on their own.)
This is about where I'm at, though I didn't quite know the evidence behind my observation that after a certain threshold higher wattage really seemed to make little or no difference outside of perhaps a benchmark test. For even quite intense everyday work, I've found it perfectly fine to limit wattage on my i9 to 27-30, maybe a little more if I absolutely need it. I guess on paper that's wasting a ton of processing capacity, but as you say, maximum power is rarely needed for most users, even power users.
That said, it would be great if we could limit the power to 40 watts, fix the driver bug and have the radeon draw no more than 5 watts, and keep the fans under around 3500 at all times.
I do find Volta (which allows you to lower the wattage on the laptop) is far more effective than simply turning off Turbo Booster. In fact, turning off Turbo Booster means my processor runs constantly at 2.3ghz, so I think it might even use more power in some instances. It doesn't seem good for the processor as well.
A big concern of mine is if Big Sur or a future OS makes it impossible for Volta or a similar software to function. That would indeed be really bad. I don't like relying on 3rd party software for something Apple could easily make themselves (windows has these functions built in).
Personally, I'm trading my i9 2.3 5500m 8GB for an i9 2.4 with a 5300M. Hoping that the better binned processor will run more efficiently at lower wattage, which I would expect based on what you've said here. It's good to know that there's a reason to run it at lower wattage beyond making room for the power suck from the dGPU.
I'm coming from a dual core laptop, so all this power is great. I'd just like a fix for the AMD bug.
One additional question for me is whether the fan profile is too aggressive on the 16 inch. I've been playing around with software which lets them come on a little slower, which helps along with the lower wattage. During the summer I have an AC on but in the winter I will be hearing these jet engines more clearly.