Apple Says 2018 MacBook Pro Throttling is a Bug, Fix Available Now in New macOS Update

Apple this morning released a new supplemental update to macOS High Sierra 10.13.6, which is designed to address a bug that caused the new eighth-generation quad-core and 6-core Intel processors in the 2018 MacBook Pro models to throttle inappropriately.

The new macOS High Sierra update can be downloaded through the Software Update function in the Mac App Store on all 2018 MacBook Pro models. Today's supplemental update (build number 17G2208) is limited to those machines and is not available for other Macs. A direct link to download the update is also available.

macbookpro2018sidebyside
According to Apple, the throttling seen in the higher-end 2018 MacBook Pro with Core i9 chip and other 2018 MacBook Pro models is unintentional.

The throttling issue first came to light on July 17, a few days after the first new 2018 MacBook Pros began shipping out to customers. YouTuber Dave Lee tested the top-of-the-line 2018 15-inch MacBook Pro with 2.9GHz Core i9 chip using Adobe's Premiere Pro and found that it was underperforming compared to a 2017 MacBook Pro with a Core i7 chip.


Multiple other tests followed from customers and media sites that obtained one of the Core i9 machines, and many came to the same conclusion, that there was an unusual amount of throttling that was impacting the machine's performance. It was not entirely clear if other 2018 MacBook Pro models were throttling unintentionally, but Apple's patch today suggests that was the case.

While there were many theories as to what was causing the throttling, Apple has discovered that there was a missing digital key in the firmware that impacted the thermal management system, driving down clock speeds under heavy thermal loads. This is what has been addressed in today's update.

Apple has apologized to customers who have experienced less than optimal performance on their new 2018 machines.

Following today's update, customers who own a 2018 MacBook Pro should see an appropriate level of throttling that is common to all devices under heavy load and does not impact performance to the point where the machine is underperforming compared to earlier, less powerful models.

Apple says that customers can expect the new 15-inch MacBook Pro to be up to 70 percent faster and the new 13-inch MacBook Pro to be up to 2X faster than 2017 models, as outlined in the performance results on the company's website.

Related Roundup: MacBook Pro 14 & 16"

Popular Stories

iphone se 4 modified flag edges

iPhone SE 4 With Face ID Said to Be Priced Below $500

Monday May 20, 2024 3:43 am PDT by
Apple is targeting a sub-$500 starting price for its upcoming fourth-generation iPhone SE model despite a raft of rumored upgrades coming to the more affordable device. According to leaker Revegnus on X, the U.S. launch price of the fourth-generation iPhone SE will either remain at the same $429 starting price as the current model, or will see an increase of around 10%. Either way, Apple's...
iOS 17

Apple Releases iOS 17.5.1 With Fix for Reappearing Photos Bug

Monday May 20, 2024 10:11 am PDT by
Apple today released iOS 17.5.1 and iPadOS 17.5.1, minor updates to the iOS 17 and iPadOS 17 operating system updates that came out last September. The 17.5.1 updates come a week after the launch of iOS 17.5 and iPadOS 17.5. iOS 17.5.1 and iPadOS 17.5.1 can be downloaded on eligible iPhones and iPads over-the-air by going to Settings > General > Software Update. According to Apple's...
iPhone 16 Camera Lozenge 2 Perspective

iPhone 16 Lineup Rumored to Come in These Two New Colors

Sunday May 19, 2024 11:08 am PDT by
Apple analyst Ming-Chi Kuo today outlined his expectations for the iPhone 16 lineup's color options, revealing that two new colors should replace two of the existing shades. Kuo outlined his expectations in a post on X (formerly Twitter) earlier today. He believes that the iPhone 16 Pro and iPhone 16 Pro Max will be available in black, white or silver, gray or "Natural Titanium," and rose....
microsoft surface pro qualcomm

Microsoft Says New Surface Pro is Faster Than 15" M3 MacBook Air

Monday May 20, 2024 3:19 pm PDT by
Microsoft is going all in on AI, today introducing a series of Copilot+ PCs that have AI-focused hardware. The new Surface Pro is one of the first Copilot+ PCs, equipped with Qualcomm's Arm-based Snapdragon X Elite processor. Microsoft is already pitting the Surface Pro against Apple's M3 MacBook Air, and in marketing materials, claims that the Surface Pro has superior processing power and...
iOS 17

iOS 17.5 Bug May Also Resurface Deleted Photos on Wiped, Sold Devices [Updated]

Friday May 17, 2024 12:24 pm PDT by
A bug in iOS 17.5 is apparently causing photos that have been deleted to reappear, and the issue seems to impact even iPhones and iPads that have been erased and sold off to other people. A Reddit user wiped an iPad following Apple's guidelines in September of 2023 before selling it off to a friend. That friend updated the iPad to iPadOS 17.5 this week, and began seeing the Reddit user's old ...
iphone se 4 modified flag edges

When to Expect the Next iPhone SE to Launch

Friday May 17, 2024 2:03 pm PDT by
It has been over two years since Apple released the third-generation iPhone SE, and rumors continue to surface about a new model. The latest word comes from The Information, which today reported that Apple plans to release a new iPhone SE with a design similar to the standard iPhone 14 in the spring of 2025. If this rumor is accurate, the iPhone SE would finally gain Face ID and a notch...

Top Rated Comments

Dydegu Avatar
76 months ago
Oh, well at least we all remained calm and no one freaked out.
Score: 94 Votes (Like | Disagree)
Baymowe335 Avatar
76 months ago
Let’s wait for the armchair engineers here to say this isn’t good enough and doesn’t address the hardware issue they concluded must exist.

See how far overreacting gets you?
Score: 68 Votes (Like | Disagree)
WestonHarvey1 Avatar
76 months ago
How did they not notice this in testing?
Score: 68 Votes (Like | Disagree)
tubeexperience Avatar
76 months ago
How about making the laptop thicker and with a better cooling system?
Score: 41 Votes (Like | Disagree)
djcerla Avatar
76 months ago
Fake news. MR forum all agrees thinness is the culprit,

/s
Score: 40 Votes (Like | Disagree)
skinned66 Avatar
76 months ago
Well at least the fix was very timely so I think credit to Apple is due.
Score: 36 Votes (Like | Disagree)