The Mac Studio M3 Ultra 28-Core CPU, introduced in March 2025, delivers cutting-edge power for the most demanding creative and professional tasks. Identified by model numbers MU973LL/A, Mac15,14, and A3389, this desktop powerhouse combines 28 CPU cores, a 60-core GPU, and massive memory bandwidth into a compact cube-shaped chassis.
Designed for video editing, machine learning, simulation, and software development, it includes a 32-core Neural Engine, Media Engine acceleration, and 96 GB of unified RAM, configurable up to 256 GB (or 512 GB with CPU upgrade). With Thunderbolt 5, 10Gb Ethernet, and Wi-Fi 6E, connectivity is ready for tomorrow’s workflows.
Mac Studio M3 Ultra 28-Core CPU Specifications
| Component | Details |
|---|---|
| Model ID / EMC | Mac15,14 / EMC 8859 |
| Order Number | MU973LL/A |
| Processor | Apple M3 Ultra – 28-Core (20 perf, 8 eff), ~4.0 GHz |
| GPU | Integrated 60-Core GPU |
| Neural Engine | 32-Core |
| Media Engine | 2 decode, 4 encode, 4 ProRes encode/decode |
| Memory (Unified) | 96 GB (configurable to 256 GB or 512 GB*) |
| Memory Bandwidth | 819 GB/s |
| Storage | 1 TB SSD (non-user-accessible but removable) |
| Storage Options | 2 TB, 4 TB, 8 TB, 16 TB |
| Display Support | Up to 8 x 6K @ 60 Hz or 4 x 8K @ 60 Hz |
| Ports (Front) | 2x Thunderbolt 5, 1x SDXC (UHS-II) |
| Ports (Back) | 4x Thunderbolt 5, 2x USB-A, HDMI 2.1, 10Gb Ethernet, 3.5mm audio jack |
| Wireless | Wi-Fi 6E (802.11ax), Bluetooth 5.3 |
| OS | macOS 15.3.2 pre-installed |
| Chassis Type | Cuboid (Aluminum) |
| Dimensions (inches) | 3.7 (H) x 7.7 (W) x 7.7 (D) |
| Weight | 8.0 lbs (3.64 kg) |
| Included Accessories | None – BYODKM (Display, Keyboard, Mouse not included) |
| Original Price (US) | $3999 (default with 96 GB RAM, 1 TB SSD) |
Standout Capabilities
- Extreme Compute Power
The Mac Studio M3 Ultra 28-Core CPU runs up to 8 external 6K displays or 4 8K displays, pushing the limits of multi-screen workflows. - Pro-Grade Memory
The system’s 96 GB unified memory offers seamless handling of massive files, multitasking, and pro rendering. Build-to-order up to 256 GB, or 512 GB with 32/80-core config. - Next-Gen I/O
With Thunderbolt 5, HDMI 2.1, 10Gb Ethernet, and an SDXC slot, connectivity is fast and flexible across AV, data, and storage ecosystems. - Designed for Silence & Space
It fits on any desk with a low-profile 7.7″ x 7.7″ footprint, no fan noise under most use cases, and a thermal design built for efficiency.
