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Tested: Apple's patch fixes the thermal slowdowns in the 2018 i9 MacBook Pro
This isn't just an Apple problem, I'm seeing a very similar issue on a brand new Dell XPS 15 with the i9-8950HK. The CPU won't go above the 2.9Ghz base clock speed unless it is under-volted using the Intel Extreme Tuning utility. Once under-volted it can sit at around 3.4Ghz but still never gets anywhere near the advertised 4.8Ghz burst speed that's advertised. There's a good chance that manufacturers have designed systems around the 45W TDP claim before having access to the i9 chips, now that the chips are available they're finding out that TDP figure isn't entirely truthful.
