Apple Addresses MacBook Pro Throttling Controversy After Working With YouTuber Dave Lee

Apple today responded to the throttling controversy surrounding the latest MacBook Pro models, noting that excessive performance degradation under extended workloads is the result of a software bug, with a fix rolling out now in the form of a Supplemental Update for macOS High Sierra 10.13.6.

2018 macbook pro side
MacRumors received the following statement from an Apple spokesperson:

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.

A bug fix is included in today's macOS High Sierra 10.13.6 Supplemental Update and is recommended. We apologize to any customer who has experienced less than optimal performance on their new systems.

Customers can expect the new 15-inch MacBook Pro to be up to 70% faster, and the 13-inch MacBook Pro with Touch Bar to be up to 2X faster, as shown in the performance results on our website.

The controversy began a week ago, when YouTube tech guru Dave Lee shared a video demonstrating that the new 15-inch MacBook Pro, maxed out with a six-core Intel Core i9 processor, was unable to maintain its base 2.9GHz clock speed while rendering a five-and-a-half minute 5K video in Adobe Premiere Pro.


In fact, the previous-generation 15-inch MacBook Pro with a Core i7 processor rendered the video in around 10 percent less time, a fact that wasn't well received by customers, some of which threatened to cancel their orders.

Apple says the bug affected performance on not only the high-end 15-inch MacBook Pro configured with a six-core Intel Core i9 processor, which has faced the most extreme throttling in tests, but also quad-core Core i7 and Core i5 configurations, extending to the latest 13-inch MacBook Pro with Touch Bar models.

Some amount of throttling is to be expected on notebooks under heavy thermal workloads, especially ones as thin as the MacBook Pro. Lee, however, argued it is the degree of throttling he experienced that is unacceptable.

Apple says it contacted Lee within 48 hours after he published his video, working with him to replicate his workflow. Apple eventually set up a system with a similar workflow, applied the fix, and both the 15-inch and 13-inch models then matched Apple's advertised performance rates.

A flurry of other YouTube videos and tests surfaced in the ensuing days, with mixed results based on varying workloads.

Marques Brownlee, who hosts the popular channel MKBHD, said the 15-inch MacBook Pro with a Core i9 exported his 8K sample video about 15 percent quicker than the previous 15-inch MacBook Pro with a Core i7. Faruk Korkmaz, who runs the YouTube channel iPhonedo, also found the Core i9 to perform "fantastic."


Apple for its part said it never experienced any issues with excessive performance degradation in its pre-production testing of the 2018 MacBook Pro, completed in June. The company did identify what it calls an isolated bug after digging deeper, and came up with what it calls a simple fix.

To be expected, Apple also talked up the new MacBook Pro, noting how most of what it has been hearing about the notebook from customers—including many professionals—has been very positive, including about performance.

Prior to Apple acknowledging this bug, speculation had mounted as to possible causes. One user believes that the throttling may have related to the power delivery chip, known as a voltage regulation module, reporting an over-power condition, throttling the CPU clock speed to scale back power.

In any case, it appears that Apple has addressed the problem.

Related Roundup: 14 & 16" MacBook Pro

Top Rated Comments

826317 Avatar
52 months ago
That was addressed pretty quickly. Good on Apple.
Score: 27 Votes (Like | Disagree)
mvp2885 Avatar
52 months ago
is everyone done bitching now? The smart people said it was a firmware or bug fix, which it was, but bangwagoners wanna jump on apple for everything :/
Score: 24 Votes (Like | Disagree)
PTLove Avatar
52 months ago
Very hard to believe Apple could not detect it given the workflow that exposes it (very normal video exporting).

Its good its fixed supposedly, but Apple does not look good here. If they actually performed "extensive testing" and failed to use Adobe Premier Export... thats not a good look.
Score: 23 Votes (Like | Disagree)
MacsRgr8 Avatar
52 months ago
YouTuber pressure worked.
Score: 20 Votes (Like | Disagree)
DrJohnnyN Avatar
52 months ago
Good on them.
Score: 19 Votes (Like | Disagree)
nutmac Avatar
52 months ago
Apple probably should've issued "we are investigating the issue" earlier, but I am very pleasantly surprised by the update.
Score: 18 Votes (Like | Disagree)

Popular Stories

macbook air m2

Exclusive: Apple Plans to Launch MacBook Air With M2 Chip on July 15

Wednesday June 29, 2022 5:23 pm PDT by
The redesigned MacBook Air with the all-new M2 Apple silicon chip will be available for customers starting Friday, July 15, MacRumors has learned from a retail source. The new MacBook Air was announced and previewed during WWDC earlier this month, with Apple stating availability will begin in July. The MacBook Air features a redesigned body that is thinner and lighter than the previous...
original iphone 2007

15 Years Ago Today, the iPhone Went On Sale

Wednesday June 29, 2022 4:43 am PDT by
Fifteen years ago to this day, the iPhone, the revolutionary device presented to the world by the late Steve Jobs, officially went on sale. The first iPhone was announced by Steve Jobs on January 9, 2007, and went on sale on June 29, 2007. "An iPod, a phone, an internet mobile communicator... these are not three separate devices," Jobs famously said. "Today, Apple is going to reinvent the...
maxresdefault

Video Comparison: M2 MacBook Pro vs. M1 MacBook Pro

Tuesday June 28, 2022 2:45 pm PDT by
Apple last week launched an updated version of the 13-inch MacBook Pro, and it is the first Mac that is equipped with an updated M2 chip. As it's using a brand new chip, we thought we'd pick up the M2 MacBook Pro and compare it to the prior-generation M1 MacBook Pro to see just what's new. Subscribe to the MacRumors YouTube channel for more videos. For the video comparison, we're using the...
iPhone vs Galaxy Larger

Apple Executive Says Samsung Copied the iPhone and Simply 'Put a Bigger Screen Around It'

Tuesday June 28, 2022 8:59 am PDT by
The Wall Street Journal's Joanna Stern today shared a new documentary about the evolution of the iPhone ahead of the 15th anniversary of the device launching on June 29, 2007. The documentary includes an interview with Apple's marketing chief Greg Joswiak, iPhone co-creator Tony Fadell, and a family of iPhone users. One segment of the interview reflects on Android smartphones gaining larger...
iPhone 11 Pro vs iPhone 14 Pro

iPhone 11 Pro vs. 14 Pro: New Features to Expect if You've Waited to Upgrade

Monday June 27, 2022 11:22 am PDT by
With many customers choosing to upgrade their iPhone every two or three years nowadays, there are lots of iPhone 11 Pro users who might be interested in upgrading to the iPhone 14 Pro later this year. Those people are in for a treat, as three years of iPhone generations equals a long list of new features and changes to look forward to. Below, we've put together a list of new features and...
Mac Studio IO

Apple Begins Selling Refurbished Mac Studio Models

Thursday June 30, 2022 7:42 pm PDT by
Apple today began selling refurbished Mac Studio models for the first time in the United States, Canada, and select European countries, such as Belgium, Germany, Ireland, Spain, Switzerland, the Netherlands, and the United Kingdom. In the United States, two refurbished Mac Studio configurations are currently available, including one with the M1 Max chip (10-core CPU and 24-core GPU) for...
rootbug

Major macOS High Sierra Bug Allows Full Admin Access Without Password - How to Fix [Updated]

Tuesday November 28, 2017 12:33 pm PST by
There appears to be a serious bug in macOS High Sierra that enables the root superuser on a Mac with a blank password and no security check. The bug, discovered by developer Lemi Ergin, lets anyone log into an admin account using the username "root" with no password. This works when attempting to access an administrator's account on an unlocked Mac, and it also provides access at the login...