Apple's M7 Ultra Chip Targets 1.5TB of Unified Memory, Matching the 2019 Mac Pro

According to Bloomberg's Mark Gurman, Apple's M7 Ultra chip is engineered to support up to 1.5TB of unified memory — a first for Apple Silicon and a capacity that matches the highest RAM configuration of the 2019 Intel Mac Pro .

The 1.5TB Memory Milestone

For years, the highest-end Intel-based Mac Pro (2019) offered up to 1.5TB of RAM, a ceiling that Apple Silicon had not previously matched. Gurman reports that the M7 Ultra is designed to finally close that gap, with a unified memory architecture capable of addressing 1.5TB . A unified memory architecture allows the CPU, GPU, and Neural Engine to access the same pool of high-bandwidth memory without copying data between separate pools — a key advantage for large AI model workloads.

How the M7 Ultra Compares

• vs. M5 Ultra (arriving 2026): The M7 Ultra's 1.5TB is roughly double the M5 Ultra's planned 768GB maximum .
• vs. Earlier Apple Silicon (M1–M4 Ultra): No prior Apple Silicon chip has been reported to exceed 192GB–256GB of unified memory. The M7 Ultra would be a roughly 6–8x increase over those earlier ceilings.
• vs. 2019 Intel Mac Pro: The top-end 2019 Mac Pro (Intel Xeon) offered up to 1.5TB of RAM as its highest configuration. Gurman reports that the M7 Ultra would finally allow Apple Silicon to match that ceiling .

Why Memory Capacity Matters for AI

Large on-device AI models, particularly large language models (LLMs), require substantial memory to store model weights and intermediate data. A 1.5TB unified memory pool would enable professionals to run models that previously required dedicated AI accelerators or cloud instances. Gurman has noted that the M7 Ultra's upgrades bring the chip close in performance to dedicated AI accelerators, including Nvidia's Blackwell .

The Supply Chain Caveat

Whether Apple actually ships a 1.5TB configuration depends on supply chain conditions. Gurman reports that the industry faces a memory chip shortage that makes such large modules expensive and difficult to source . Apple has reportedly already postponed the Mac Studio refresh because of memory chip supply issues and price increases . The company has tested support for up to 768GB of unified memory in the M5 Ultra, but supply constraints could prevent it from launching with an option for that much memory .

Timeline

The M7 Ultra is expected sometime in 2028, following the base M7 chip in early 2027 and the M7 Pro/Max in late 2027 . Apple is reportedly skipping the M6 Pro and M6 Max entirely to fast-track the AI-focused M7 generation .