- 256GB unified memory — holds the entire model on one machine, with no splitting
- 1.2TB/s memory bandwidth — determines how fast answers are generated
- 64-core GPU and 32-core Neural Engine — handle prompt processing
- Runs models of up to ~307B parameters at 4-bit quantization (estimate)
Which AI models can the Mac Studio M5 Ultra 256GB run?
Memory decides whether a model fits on the machine at all; bandwidth decides how fast it answers. The selected configuration has 256GB of memory and 1.2TB/s of bandwidth.
| Memory | Available to the model | Max model size | What it can do |
|---|---|---|---|
| 36GB | ~27GB | ~43B parameters | Q&A over internal documents, summarizing, drafting — small teams |
| 48GB | ~36GB | ~57B parameters | Q&A over internal documents, summarizing, drafting — small teams |
| 64GB | ~48GB | ~76B parameters | Larger models, longer context, serving many concurrent users |
| 96GB | ~72GB | ~115B parameters | Larger models, longer context, serving many concurrent users |
| 128GB | ~96GB | ~153B parameters | Very large models, or several models side by side on one machine |
| 256GB | ~192GB | ~307B parameters | Very large models, or several models side by side on one machine |
Estimates based on: a 4-bit quantized model takes ~0.5 bytes per parameter; macOS lets the GPU use ~75% of memory; 20% is reserved for context. These are not benchmark results — we test on real hardware for you before you commit.
Who the 256GB configuration is for
Small teams getting started with on-premise AI
Up to 48GB · your 256GB configuration
Q&A over your internal documents, summarizing and drafting for a small group of users. A good fit if your business is new to AI and wants its data to stay in the office.
Many users, larger models
64–96GB · your 256GB configuration
Larger models and longer context (multi-page files and contracts), serving many people asking questions on the same internal network.
Very large models or multiple models
128GB and up · your 256GB configuration
Run very large models, or several models side by side on one machine (for example, one model for Q&A and one dedicated to document processing).
There is no fixed user count per tier: it depends on the model, prompt length and how many people ask at once. Namtech measures against your real workload before you commit to a configuration.
Tech specs
| Chip | Apple M5 Ultra |
|---|---|
| CPU | 30 cores |
| GPU | 64 cores |
| Neural Engine | 32 cores |
| Unified memory | 256GB |
| Memory bandwidth | 1.2TB/s |
| Storage | 1TB |
| Ports | 4× Thunderbolt 5 (USB-C, up to 120Gb/s, DisplayPort 2.1) · 2× USB-A (up to 5Gb/s) · 1× HDMI 2.1 · 1× 10Gb Ethernet (Nbase-T, RJ-45) · 3.5 mm headphone jack · Front: SDXC card slot (UHS-II) + 2× USB-C 10Gb/s (M5 Max) or 2× Thunderbolt 5 (M5 Ultra) · Wi-Fi 7 (802.11be), Bluetooth 6, Thread — Apple N1 chip |
| Display support | M5 Max: up to 5 external displays · M5 Ultra: up to 8 external displays (6K@60Hz) |
| Dimensions | Height 9.5 cm · Width 19.7 cm · Depth 19.7 cm |
| Weight | 3.6 kg |
| Power | 100–240V AC, maximum continuous power 480W · operating temperature 10–35°C |
| In the box | Mac Studio and power cord |
Specifications from apple.com/vn, updated September 24, 2026. Prices on this page include VAT.
Other configurations
Accessories for Mac Studio and Mac mini
Genuine Apple keyboards, mice, trackpads, cables and Studio Display monitors compatible with Mac Studio and Mac mini, selected using the compatibility filter on apple.com/vn. You can order them together with your Mac.
Keyboards · mice · trackpads7 products
Magic Mouse (USB‑C) - White Multi-Touch Surface
2.360.000₫
Magic Trackpad (USB‑C) - White Multi‑Touch Surface
3.600.000₫
Magic Keyboard (USB-C) - US English
2.760.000₫
Magic Keyboard with Touch ID for Mac models with Apple silicon (USB-C) - US English
4.160.000₫
Magic Keyboard with Numeric Keypad for Mac models
3.600.000₫
Magic Keyboard with Touch ID and Numeric Keypad for Mac models with Apple silicon (USB-C) - US English
4.980.000₫
Magic Keyboard with Touch ID and Numeric Keypad for Mac models with Apple silicon (USB-C) - US English - Black Keys
5.540.000₫
Chargers · cables · adapters7 products
60W USB-C Charge Cable (1m)
650.000₫
240W USB-C Charge Cable (2m)
970.000₫
Thunderbolt 5 (USB‑C) Pro Cable (1m)
2.240.000₫
Thunderbolt 4 (USB-C) Pro Cable (1.8m)
3.880.000₫
Thunderbolt 4 (USB-C) Pro Cable (3m)
4.780.000₫
USB-C to USB Adapter
640.000₫
USB-C Digital AV Multiport Adapter
2.490.000₫
Displays10 products
Studio Display - Standard glass - Tilt-adjustable stand
54.000.000₫
Studio Display - Standard glass - Tilt- and height-adjustable stand
66.000.000₫
Studio Display - Standard glass - VESA mount adapter
54.000.000₫
Studio Display - Nano-texture glass - Tilt-adjustable stand
63.600.000₫
Studio Display - Nano-texture glass - Tilt- and height-adjustable stand
75.600.000₫
Studio Display - Nano-texture glass - VESA mount adapter
63.600.000₫
Studio Display XDR - Standard glass - Tilt- and height-adjustable stand
108.000.000₫
Studio Display XDR - Standard glass - VESA mount adapter (stand not included)
96.000.000₫
Studio Display XDR - Nano-texture glass - Tilt- and height-adjustable stand
117.600.000₫
Studio Display XDR - Nano-texture glass - VESA mount adapter (stand not included)
105.600.000₫
Mac Studio M5 Ultra 30/64 256GB FAQ
What size AI model can the Mac Studio M5 Ultra 30/64 256GB run?
About 307B parameters at 4-bit quantization. With 256GB of unified memory, about 192GB is available for the model after leaving room for the operating system and conversation context. This is an estimate to help you choose a machine; the real figure depends on the specific model, context length and number of concurrent users.
Can the Mac Studio M5 Ultra 256GB run a 70B model?
Yes. The 256GB configuration holds models up to about 307B parameters at 4-bit quantization, so a 70B model fits entirely on the machine. The machine still has spare memory for long context, many users or running additional models.
How many users is the 256GB configuration suitable for?
Very large models or multiple models. Run very large models, or several models side by side on one machine (for example, one model for Q&A and one dedicated to document processing). The actual number of concurrent users depends on the model and prompt length, so Namtech measures on real hardware against your workload before you commit to a configuration.
How much does the Mac Studio M5 Ultra 30/64 256GB cost?
324.000.000₫, VAT included, with the default 1TB SSD. Namtech issues invoices to businesses and advises on the configuration for the models you need to run. Storage can be upgraded from 1TB to 16TB, with the price updating instantly in the configurator at the top of the page.
Can I upgrade the RAM after purchase?
No. Mac Studio memory is built into the chip, so you must choose the right amount when you order. That is why you should work out the size of the models you plan to run before you decide.
Should I choose the M5 Ultra 30/64 256GB or the M5 Ultra 36/80 256GB?
Both have 256GB, so they run the same model sizes (~307B) with the same 1.2TB/s bandwidth. The difference is the GPU: 64 cores vs 80 cores — more cores read long prompts faster. Price: 324.000.000₫ vs 366.900.000₫, VAT included.