Thank you for your feedback,
@MJAU.
Please rest assured, the 15" is perfectly capable to avoid thermal throttling.
After 15min of Prime95 (Small FTT's), the R9 3900 is still running at 3.5GHz on all 12 Cores with only ~82°C CCD1 temperature.
In Furmark+Prime with R9 3950X, the CPU Temperature rises to only 90°C which is still below throttling point.
Or to put this into performance results:
17" would not make such a big difference on cooling. The empty air volume might increase, but the heatpipes get longer and you don't want to increase the thickness, so you can't use much thicker fans either.
Currently there is no plan for a 17" on this platform. But if XMG APEX 15 sells well, I'm sure the ODM will consider it when they update their roadmap later this year.
Cheers,
Tom
p/s. Feel free to follow our subreddit at
/r/XMG_gg for more in-depth discussion.