Apple Watch Series 12 and Ultra 4 feature unannounced double RAM upgrade

Apple Watch Series 12 and Ultra 4 double RAM to 4 GB

Developers discovered, via Xcode 27, that the freshly announced Series 12 and Ultra 4 both ship with 4 GB of RAM. The previous generation — Series 11 and Ultra 3 — were limited to 2 GB, meaning the new watches offer twice the memory capacity. Apple has not highlighted the memory increase in its event presentation, but the developer tools make the specification visible to third‑party developers.

MacRumors confirms the same figure, noting that the RAM bump aligns with the devices’ new S11 processor. The consistency across independent sources suggests the memory upgrade is a genuine hardware change rather than a software‑only optimization.

New S11 chip fuels AI‑centric watchOS 27 features

The same S11 silicon that powers the RAM‑enhanced watches is described by 9to5Mac as “the first meaningful performance upgrade on Apple Watch in years.” According to MacRumors, the chip is intended to enable a suite of AI functions, such as Live Rewind text snippets and Siri Recap summaries, when the watch is paired with an iPhone 15 Pro or newer. The larger memory pool will help these on‑device intelligence tasks run smoothly, reducing reliance on cloud processing.

Apple has not explicitly linked the RAM increase to the AI capabilities, but the hardware launch coincides with the rollout of watchOS 27, which introduces a broader set of Apple Intelligence features.

Battery life claims and real‑world expectations

Apple’s marketing for the Ultra 4 lists a maximum of 50 hours of usage on a charge, up from 42 hours for the Ultra 3. In Low Power Mode, the company advertises up to 84 hours, while continuous GPS tracking is said to last 45 hours. The Series 12, priced at $399, shares the same S11 efficiency but does not receive a separate battery claim in the coverage examined.

PCMag’s hands‑on reviewer notes a historical pattern where Apple’s official estimates tend to be conservative. In real‑world testing, the Ultra 3 delivered 63 hours of endurance, exceeding the 42‑hour claim. PCMag suggests that real‑world performance of the Ultra 4 could similarly surpass the official 50‑hour figure.

PCMag also points out that the Ultra 4’s rugged titanium shell is unchanged from the Ultra 3, and the watch shares the same AI health insights, sharper sensors, and Audio Intelligence features as its $399 Series 12 sibling.

Pricing stays consistent despite hardware boost

Both MacRumors and the Amazon pre‑order page confirm that the entry‑level pricing for the Series 12 and Ultra 4 remains unchanged from the prior generation, $399 for the Series 12 and $799 for the Ultra 4. This pricing continuity occurs even as the devices incorporate twice the RAM and a new processor, amid a broader industry memory shortage that has driven up component costs.

Developers will now have the memory headroom to explore more sophisticated on‑device AI applications, and upcoming real‑world battery tests may reveal whether Apple’s endurance claims hold up. The next major milestone will be the public release of watchOS 27, which will put the S11 chip and its doubled RAM to the test in everyday usage.