Buried in Apple’s macOS 27 Golden Gate feature list is one line easy to miss: “higher resolutions on ultrawide displays, such as 5K at 120Hz.” Apple does not name a display on that page, but its own product pages for Mac Studio and Studio Display XDR point at exactly which hardware combination reaches that number.
Key facts
| Item | Detail, from Apple’s own pages |
|---|---|
| macOS 27 display feature | Higher resolutions on ultrawide displays, such as 5K at 120Hz |
| Display that natively supports 120Hz | Studio Display XDR, with Adaptive Sync 47Hz to 120Hz |
| Mac that Apple names for this | Mac Studio with M5 Max |
| Apple’s stated multi-display figure | Up to four Studio Display XDR units at 5K and 120Hz from one Mac Studio |
| Studio Display XDR price | $3,299 ($3,199 education) |
The display side of the equation
Studio Display XDR, which Apple introduced in March 2026, is a 27-inch 5120-by-2880 mini-LED panel with 2,304 local dimming zones, up to 1000 nits full-screen SDR brightness, 2000 nits peak HDR, and a refresh range Apple lists as Adaptive Sync 47Hz to 120Hz. The standard Studio Display, sold alongside it at $1,599, is the more common 5K panel but is not the model Apple ties to the new 120Hz ultrawide support.
| Display | Resolution | Refresh | Price |
|---|---|---|---|
| Studio Display | 5K Retina, 600 nits | Standard | $1,599 |
| Studio Display XDR | 5120 x 2880, mini-LED | Adaptive Sync 47Hz to 120Hz | $3,299 |
The Mac side of the equation
Apple’s own Mac Studio press release states that a Mac Studio with M5 Max “drives up to 8 displays, or 4 Studio Display XDR at 5K/120Hz.” That is a specific, quotable claim: one Mac Studio, four Studio Display XDR units, all at full resolution and full refresh rate at once, a configuration that needs both the display’s 120Hz panel and a chip built to feed four of them simultaneously.
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- Studio Display XDR supplies the 120Hz hardware ceiling
- macOS 27 supplies the software support for higher ultrawide resolutions at that refresh rate
- Mac Studio with M5 Max is the configuration Apple names as capable of driving four such displays at once
The chip behind the number
Apple’s own M5 Max specifications explain why a single Mac Studio can push four 5K, 120Hz panels at once rather than one or two. Apple lists M5 Max at up to a 40-core GPU with Neural Accelerators in every core, up to 128GB of unified memory, and memory bandwidth up to 614GB/s, more than four times what the entry M6 chip in the smaller Mac mini carries. Driving four independent 5K signals at 120Hz, rather than one shared signal split across displays, is a bandwidth problem before it is anything else, and Apple’s own figures are the explanation for why the company names a specific chip rather than simply saying “Mac Studio.”
What this is not
Apple Intelligence and macOS 27’s own compatibility list both reach back to M1 Macs from 2020, and nothing about the ultrawide 5K at 120Hz line changes that baseline for the operating system as a whole. What is chip-specific is the multi-display ceiling Apple actually quotes: four Studio Display XDR units at full resolution and full refresh rate is a Mac Studio M5 Max claim, not a claim about every Mac that installs macOS 27 on Monday.
This is not a claim that every Mac now drives 5K at 120Hz, and it is not a new display announcement; Studio Display XDR shipped in March. What changed with macOS 27 is the operating system explicitly listing higher-resolution ultrawide support, including 5K at 120Hz, as a feature of the release itself rather than something buried in a spec sheet. Apple groups it with other macOS 27 changes covered for the OS broadly in the iOS 27 release date piece and the event recap, both from the same week Apple detailed the new Mac desktops that ship September 22.
What Apple has not said
Apple has not stated whether the 5K at 120Hz ultrawide support requires macOS 27 specifically on the Mac side, or whether it also works on an M5 Max Mac Studio still running macOS 26 connected to Studio Display XDR. Apple has also not published which older Apple silicon Macs, if any, can drive a single Studio Display XDR at the full 120Hz rather than a lower refresh rate, and has not said anything about ultrawide third-party monitors beyond its own Studio Display line.
Anyone weighing the display and the Mac together has two dates to watch: macOS 27 Golden Gate on Monday, September 14, and the Mac Studio itself reaching general sale on September 22, the same week Apple detailed the chip driving four of these displays at once.
