Graphical Glitches Plaguing Some 2020 iMac Owners With Radeon Pro 5700 XT GPU
Apple in August refreshed the 2020 iMac lineup with a new 27-inch model that's equipped with 10th-generation Intel processors, more RAM, more SSD settings, and faster AMD GPUs.
Unfortunately, some new Mac owners have been running into problems with their machines and have been reporting ongoing glitching with the graphics. There's a 57-page thread on the MacRumors forums filled with complaints dating back to August, suggesting this is a problem that's been impacting iMac owners since the new Macs came out.
Based on a poll, a good number of iMac owners who have the higher-end 5700XT GPU are seeing a white horizontal line flicker across the display on occasion, but the problem does not seem to impact all users.
MacRumors reader
torifile describes the issue:
I got my 2020 iMac Thursday night. It's as fast as expected and gorgeous. Last night I thought I saw, out of the corner of my eye, a horizontal white line flash mid-way up the screen. It was really fleeting and I thought I was just seeing things. This morning, I saw the same thing. The computer isn't running hot or anything. iStat Menus has all the cores untaxed. I recall having this same problem with my MBP 13" (2019) with an earlier version of macOS (I can't remember if it was a late Mojave build or an early Catalina) and it was cleared up with a software update.
The white line described by those affected appears to flash across the screen at random intervals throughout the day, and there are some other seemingly related graphical issues that iMac owners have run into. Some users have reported being able to remedy the problem by choosing a scaled resolution other than the default, but that's not an ideal longterm solution.
It's not clear if the issue that iMac owners are experiencing is hardware or software based, but Apple has not yet implemented a fix for the problem.
Popular Stories
If you pay for iCloud storage on your iPhone, Apple has a new perk for you, at no additional cost.
The new perk is the ability to create invitations in the Apple Invites app for the iPhone, which launched in the App Store last month.
In the Apple Invites app, iCloud+ subscribers can create invitations for any occasion, such as birthday parties, graduations, baby showers, and more. Anyone ...
While the first iOS 19 beta is still more than two months away, there are already plenty of rumors about the upcoming software update.
Below, we recap the key iOS 19 rumors so far.
visionOS-Like Design
In January, the YouTube channel Front Page Tech revealed a redesigned Camera app that is allegedly planned for iOS 19.
According to Front Page Tech host Jon Prosser, the Camera app...
While the iPhone 17 Pro and iPhone 17 Pro Max are not expected to launch until September, there are already plenty of rumors about the devices.
iPhone 17 Pro's alleged design via Front Page Tech
Below, we recap key changes rumored for the iPhone 17 Pro models as of March 2025:
Aluminum frame: iPhone 17 Pro models are rumored to have an aluminum frame, whereas the iPhone 15 Pro and iPhone...
We're not getting new Siri Apple Intelligence features in iOS 18.4 as expected, but the upcoming update does have quite a few new additions that will be worth upgrading for. We've rounded up the five best features to look forward to, and if you're not running the beta, you can expect to get access to these in early April.
Priority Notifications
If you have an iPhone or iPad that supports...
Is Apple experiencing a "Vista-like drift into systemically poor execution?"
That was a question posed by well-known technology analyst Benedict Evans, in a recent blog post covering Apple's innovation and execution, or seemingly lack thereof as of late. He is referring to Microsoft's Windows Vista operating system, which was widely criticized when it launched in 2007 due to software bugs,...
In select U.S. states, residents can add their driver's license or state ID to the Wallet app on the iPhone and Apple Watch, providing a convenient and contactless way to display proof of identity or age at select airports and businesses, and in select apps.
Unfortunately, this feature continues to roll out very slowly. It has been three and a half years since Apple first announced the...
Seasoned leaker Sonny Dickson has shared more dummy models of Apple's upcoming iPhone 17 series, with the latest lot revealing a noticeable shift in Apple's iPhone Pro model design that goes beyond the much-talked-about new rear camera bar.
Dickson points out that the iPhone 17 Pro dummy models feature an outlined area on the back, beginning just below the camera module and extending to the...
Despite being released over two years ago, Apple's AirPods Pro 2 continue to dominate the wireless earbud market. However, with the AirPods Pro 3 expected to launch in 2025, anyone thinking of buying Apple's premium earbuds may be wondering if the next generation is worth holding out for.
Apart from their audio and noise-canceling performance, which are generally regarded as excellent for...
A few years ago, the American automaker General Motors (GM) announced that it would be phasing out support for CarPlay and Android Auto in its new electric vehicles, in favor of its own software platform. It was a controversial decision, as many drivers who are in the market for a new vehicle consider CarPlay to be a must-have feature.
Looking to capitalize on the situation, one GM...
