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MAXED Mac Studio M3 Ultra 80-Core GPU | 512GB Unified Memory | 16TB SSD | 2025

This is the fully maxed-out M3 Ultra configuration featuring a 32-core CPU, 80-core GPU, 512GB of unified memory with 819GB/s memory bandwidth, and a 16TB SSD. Every build-to-order (BTO) option is configured to Apple's highest available specification. Model Number: A3389.

In March 2026, Apple removed the 512GB unified memory option from the Mac Studio configurator due to the global DRAM shortage. In April 2026, Apple also removed the 128GB and 256GB memory options. As of May 2026, the highest memory configuration available on a new Mac Studio from Apple is 96GB. According to Bloomberg's Mark Gurman (April 19), the M5 Ultra is expected to launch in October 2026 and is anticipated to support up to 256GB of unified memory. This 32-core CPU / 80-core GPU / 512GB RAM / 16TB SSD configuration can no longer be ordered from Apple.

THE ULTIMATE CONFIGURATION

This is not a standard M3 Ultra Mac Studio. Every BTO option is configured to Apple's highest specification.

• 32-core CPU (upgraded from the 28-core base model)

• 80-core GPU (upgraded from the 60-core base model, delivering approximately 33% more GPU compute performance)

• 512GB Unified Memory (discontinued configuration)

• 16TB SSD (Apple's maximum storage option)

The 80-core GPU is the configuration used in most published LLM benchmarks. Performance reviews, benchmark results, and token-per-second figures commonly reference the 80-core model, while the 60-core version delivers lower performance in highly parallel AI workloads. If you're buying a Mac Studio for local AI inference, this is the highest-performance configuration.

The 16TB SSD provides ample space for large AI model libraries. A DeepSeek V3 checkpoint requires approximately 400GB of storage, R1 requires around 700GB, and Llama 3.1 405B quantizations typically range from 200GB to 800GB depending on the quantization level. With 16TB of storage, you can keep multiple models, datasets, and fine-tuning checkpoints available without constantly deleting and re-downloading files.

SPECIFICATIONS

• Apple M3 Ultra

• 32-core CPU

• 80-core GPU

• 32-core Neural Engine

• 512GB Unified Memory (819GB/s memory bandwidth)

• 16TB SSD

• Front: 2 Thunderbolt 5 ports, SDXC card slot

• Rear: 4 Thunderbolt 5 ports, 2 USB-A ports, HDMI, 10Gb Ethernet, 3.5mm headphone jack

• 2025 Mac Studio

• Model Number: A3389

• Serial Number: GW5QGKW2YY (can be verified using Apple's Coverage Checker)

IDEAL FOR LOCAL AI AND LLM WORK

• Run massive models locally, including DeepSeek V3 (671B), R1 (685B), and Llama 3.1 405B

• 819GB/s unified memory bandwidth provides excellent AI inference performance

• 16TB SSD accommodates extensive model libraries, datasets, and fine-tuning checkpoints

• Compatible with EXO for distributed inference across multiple Macs

• Quiet operation with significantly lower power consumption than traditional multi-GPU systems

CONDITION & INCLUDED ITEMS

• Excellent condition

• Smoke-free home

• Light desk use only

• Original Apple packaging included

• Original power cable included

• Factory reset with the latest version of macOS installed and ready for setup