So, I'm a bit late to the party, but by popular demand:
Methodology: run Unigine Valley Benchmark while simultaneously forcing 100% CPU uptime by spawning 12 yes processes.
Results: the screenshot shows the state after 10 minutes of running. The CPU has stabilised at 2.7Ghz and 30@ of power consumption, the GPU has also stabilised at 30W power consumption. The FPS has dropped by about 30%.
Discussion:
- The throttling is very minimal, the CPU — even with GPU drawing 30Watts — stably operates at frequency just 5% below nominal. This is a stark contrast to my previous i9 MBP which would clock down below 2Ghz in such scenario.
- The CPU seems to be about 10% faster than my previous i9 MBP. I don't know whether its luck of the draw or whether its because of power delivery and control system has been improvements.
- It seems that the MBP now operates as a true combined TDP system (this is different from earlier models!). When CPU does not need much power, GPU can consume up to 50Watts, and the other way around. The combined TDP appears to be around 70Watts, I tried different usage scenarios and that is the figure I've seen repeatedly. It makes sense, since that is what the power adapter can provide (when you add other components to the mix).
Final thoughts:
First of all, this thing is a
monster. I am very impressed by the performance this thin chassis can put out. The GPU is very capable and far surpasses anything on the market in that power bracket (I will run 3dmark later, must to the office first). If my interpretation of combined TDP operation is correct, you will also get optimised performance under hybrid usage scenarios, just like the Intel/AMD Kaby Lake G+Vega M system — power is diverted to the GPU or the CPU as needed.
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Its the same as any other MacBook Pro in the last 10+ years... If the system is mostly idling, its cool and inaudible. If you run something that demands high performance, it will get hot and eventually loud. Depends on the software you run. Has been very quiet so far in the few hours that I've been using Xcode and writing a paper. Has been also rather loud when I was building Clang or running the stress test