That's not just rumors. In the interview, Craig Federighi said:
> I’d say longer than six months ago. But I think we designed ourselves into a bit of a thermal corner, if you will. We designed a system that we thought with the kind of GPUs that at the time we thought we needed, and that we thought we could well serve with a two GPU architecture… that that was the thermal limit we needed, or the thermal capacity we needed. But workloads didn’t materialize to fit that as broadly as we hoped.
https://techcrunch.com/2017/04/06/transcript-phil-schiller-c...
Sorry, I worded that funny. Federighi confirmed it so it's not a rumor now, but I meant that they had heard those rumors before this announcement.
Re:Apple admits the Mac Pro was a mess
by mixmastamyk on Thursday April 06, 2017 @11:30PM
(#14056885)
Shouldn't new chips with a smaller process be cooler?
I guess they were really really close to the edge with that design, and Marco said he's heard those GPUs are failing from heat issues fairly often.