Mac Studio M4 Max 128GB Price & Used Prices: Which Local LLMs Can It Run?
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The Mac Studio M4 Max 128GB (Apple, 2025) runs the 176B Qwen3.8 Flash Next at 4-bit at about 71 tokens/s. With long documents, the first word is slow.
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Mac Studio M4 Max 128GB price history
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Full Mac Studio M4 Max 128GB specifications
- Memory128 GB · LPDDR5X-8533 · unified memory
- Bandwidth546 GB/s
- Chip
- Apple M4 Max
- CPU
- 16-core
- GPU
- 40-core
- Storage
- 512 GB / 1 TB / 2 TB / 4 TB / 8 TB
- Ecosystem
- Metal
- Power
- 480 W
- Weight
- 2.74 kg
- Model identifier
- Mac16,9
- Type
- Unified memory
- Launch date
- Mar 12, 2025
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What LLMs can a single Mac Studio M4 Max 128GB run?
One M4 Max 128GB is best with Qwen3.8 Flash Next at 4-bit; 300B-class MoE fits only at 2-bit. Above about 96GB, raise the macOS GPU memory limit.
| Model | Size | Runs? | Speed t/s | Max context |
|---|---|---|---|---|
 Gemma 4 31B30.7B | 11.8 GB | Runs | 31.9 | 256K |
 Qwen3.6 35B A3B36B (3B active) | 12.3 GB | Runs | 136.1 | 256K |
| Qwen3.8 Flash Next176B (6B active) | 78.9 GB | Runs | 88 | 256K |
 DeepSeek V4 Flash284B (13B active) | 96.8 GB | Runs | 65.2 | 1M |
 Hy3295B (21B active) | 107.2 GB | Runs | 38.4 | 86K |
 GLM 5.3 Flash320B (18B active) | 108.7 GB | Runs | 51.5 | 1M |
| Model | Size | Runs? | Speed t/s | Max context |
|---|---|---|---|---|
| Gemma 4 31B30.7B | 18.3 GB | Runs | 21.3 | 256K |
| Qwen3.6 35B A3B36B (3B active) | 22.1 GB | Runs | 107.5 | 256K |
| Qwen3.8 Flash Next176B (6B active) | 111.3 GB | Runs | 71.4 | 256K |
| DeepSeek V4 Flash284B (13B active) | 155.1 GB | Too big | — | — |
| Hy3295B (21B active) | 182.2 GB | Too big | — | — |
| GLM 5.3 Flash320B (18B active) | 199.7 GB | Too big | — | — |
| Model | Size | Runs? | Speed t/s | Max context |
|---|---|---|---|---|
| Gemma 4 31B30.7B | 32.6 GB | Runs | 12.3 | 256K |
| Qwen3.6 35B A3B36B (3B active) | 36.9 GB | Runs | 81.6 | 256K |
| Qwen3.8 Flash Next176B (6B active) | 188.2 GB | Too big | — | — |
| DeepSeek V4 Flash284B (13B active) | 161.9 GB | Too big | — | — |
| Hy3295B (21B active) | 317.7 GB | Too big | — | — |
| GLM 5.3 Flash320B (18B active) | 341 GB | Too big | — | — |
RunsFits fully in VRAM; speed is estimated from VRAM bandwidth.
Too bigWon’t fit on one card at this quantization, even with RAM offload.
Full calculation rules are on the Methodology page.
Who it suits
Good fit
- You mainly run 30B-class MoE models like Qwen3.6 35B A3B
About 108 tokens/s at 4-bit, with the full 256K of context
- You want to run Qwen3.8 Flash Next on one machine
At 4-bit (111.3 GB) it does about 71 tokens/s, once you raise the GPU memory limit
- You want a local model server that stays on year-round
The system's maximum continuous power is 480W, and unlike a laptop, it isn't held back by an adapter's power rating
Not a good fit
- You often do RAG or feed it long documents
Prompt processing is slow, under a third of the DGX Spark's in community tests
- You want DeepSeek V4 Flash or GLM 5.3 Flash at 4-bit
They need 155 to 200 GB, so you have to drop to 2-bit
- You depend on vLLM, SGLang or CUDA-based fine-tuning tools
On the Mac, it's mainly MLX and llama.cpp
Before you buy
Only the 40-core GPU version has 128GB
The M4 Max comes with a 32-core or 40-core GPU, and 128GB is only available with the 40-core GPU version, which has 546 GB/s of bandwidth. The 32-core version has only 410 GB/s and generates about 25% slower. Used listings often say just “M4 Max”, so check the GPU core count and memory in System Information before buying.
Raise the GPU memory limit
By default, macOS lets the GPU use only about 96 GB, so models over 100 GB won't fit if you just run them. Raise the limit in Terminal with a command like sudo sysctl iogpu.wired_limit_mb=122880; on a 128GB machine, you generally leave 8 to 16 GB for the system. The setting resets to default after a reboot, so you need to set it again.
Two routes: MLX and GGUF
There are two main engines for running models on a Mac: llama.cpp (which reads GGUF files) and Apple's MLX. LM Studio includes both and lets you switch per model. Ollama also added an MLX engine on Apple silicon starting with version 0.19 (March 2026) and has since extended it to more models; models that don't use MLX still run on llama.cpp.
This generation is discontinued
Since August 2026, the Mac Studio's configurations have switched to the M5 Max and M5 Ultra, and the M4 Max version is now mainly available used or as remaining stock. The new model also tops out at 128GB but processes prompts much faster; see the comparison below.
Compared with similar machines
Mac Studio M4 Max 128GB vs Mac Studio M5 Max 128GB, DGX Spark 128GB, and Ryzen AI Max+ 395 128GB: price, memory, bandwidth, compute and local LLM speed compared.
| Spec | Mac Studio M4 Max 128GB | Mac Studio M5 Max 128GB |  DGX Spark 128GB | Ryzen AI Max+ 395 128GB |
|---|---|---|---|---|
| Memory | 128 GB | 128 GBSame | 128 GBSame | 128 GBSame |
| Bandwidth | 546 GB/s | 614 GB/s12% higher | 273 GB/s50% lower | 256 GB/s53% lower |
| BF16 / FP16 compute | — | — | 125 TFLOPS | 59 TFLOPS |
| INT8 compute | — | — | 250 TOPS | 59 TOPS |
| Qwen3.8 27B speed (2-bit) | 39.3 t/s | 43.9 t/s12% faster | 20.2 t/s49% slower | 19 t/s52% slower |
| Largest dense model (4-bit) | 222B | 222BSame | 222BSame | 222BSame |
| Power | 480 W | 480 WSame | 240 W50% lower | 120 W75% lower |
| Released | 2025-03 | 2026-08 | 2025-10 | 2025-03 |
| eBay median |
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