Apple Issues A Fix For Mac
PCMag reviews products, but we may earn affiliate commissions from buying links on this page.. A software problem is preventing the processors in several models of new Apple MacBook Pros from operating at their full clock speed under some heavy workloads, Apple confirmed on Tuesday. The company is rolling out an operating system update that it says will correct the issue, which affects earlier this month. These new models have more powerful four- or six-core Intel Core i5, Core i7, and Core i9 processors that generate significant heat when they are running at their maximum clock speeds for long periods. The laptops' thermal-management system was programmed incorrectly to deal with this heat, Apple said, which resulted, in some cases, in the new systems lowering clock speeds under heavy thermal loads. 'Following extensive performance testing under numerous workloads, we've identified that there is a missing digital key in the firmware that impacts the thermal management system and could drive clock speeds down under heavy thermal loads on the new MacBook Pro,' an Apple spokesperson told PCMag. 'We apologize to any customer who has experienced less than optimal performance on their new systems.'
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Apple said that a software update, macOS High Sierra 10.13.6 Supplemental Update, will be available for download today from the Mac App Store to correct the problem. The company recommends that all owners of the new Touch Bar-equipped and 15-inch MacBook Pro install the update. Tuesday's firmware update comes after that the top-of-the-line 15-inch MacBook Pro with a Core i9 processor was running, at times, at 2.2GHz under heavy workloads, such as rendering video in. The Core i9 in that model is designed to run at a base clock frequency of 2.9GHz, with a 4.9GHz maximum using Intel's Turbo Boost technology. In a posted last week, technology commenter Dave Lee claimed that not only was the Core i9-equipped MacBook Pro running slower than its base clock speed, but that it was also completing video rendering tasks 11 percent slower than the previous-generation MacBook Pro with a Core i7 processor. Apple replicated the issue by conducting its own testing using a similar but not identical workflow to the one Lee demonstrated, according to sources familiar with the matter.
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The tests showed throttling not only on the Core i9 laptop, but on all of the models that were announced this month. The base-model 13-inch MacBook Pro without a Touch Bar is not affected, as that machine was not updated in the 2018 refresh. PCMag has not independently verified the throttling issues that Lee reported on the 15-inch MacBook Pro. However, our 13-inch MacBook Pro sample did experience some graphics-stuttering issues in the course of testing in PC Labs that could be attributed to thermal throttling. We were consulting with Apple on diagnosing these issues when we were given an advance heads-up about the July 24 macOS update.