Mac Studio M3 Ultra 256GB经济之选
256 GB Unified (+128)819 GB/s (+546)
B
Adds memory headroom for longer context windows and future model growth.42 tok/s 解码
Adds memory headroom for longer context windows and future model growth.
~$6,999 MSRP
Can Qwen 2.5 3B run on NVIDIA DGX Spark 128GB?
YES — Runs Great
B62Good
Estimated from fit model
Qwen 2.5 3B needs ~18.3 GB VRAM. NVIDIA DGX Spark 128GB has 108.8 GB. With Q4_K_M quantization, expect ~42 tok/s.
Runtime: OllamaCapacity: RoomyBandwidth: LowStack: BasicBottleneck: Balanced
Operating mode
Choose the run profile you care about
Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.
Current mode
Balanced
Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.
Select quantization to explore
Q4_K_M (Medium quality) — 18.3 GB, 42.0 tok/s, Runs well
18.3 GB required108.8 GB available
17% VRAM used
Fit status
Runs well
Decode
42.0 tok/s
TTFT
4610 ms
Safe context
131K
Memory
18.3 GB / 108.8 GB
Memory breakdown
Weights1.8 GB
KV Cache2.2 GB
Runtime1.2 GB
Headroom13.1 GB
See how fast it feels
See how fast it feelsQwen 2.5 3B on NVIDIA DGX Spark 128GB
1st promptCold start — includes initialization
>What is local AI inference?
Local AI inference means running an AI language model directly on your own hardware — your laptop, desktop, or server — instead of sending requests to a remote cloud API.
When you run inference locally the model weights are loaded into your GPU or unified memory. Each token you generate requires reading those weights from memory, so memory bandwidth is the main bottleneck for decode speed.
Key benefits of running locally:
- Full privacy: your prompts never leave your machine
- No per-token cost or rate limits
- Works offline once the model is downloaded
- Latency depends only on your hardware
2nd promptWarm — model ready, no init overhead
>How much VRAM do I need?
It depends on the model size and quantization level. A rough rule of thumb:
Model size Q4 (4-bit) Q8 (8-bit) FP16
7B params ~4.3 GB ~7.5 GB ~14 GB
13B params ~7.9 GB ~13.9 GB ~26 GB
70B params ~42.7 GB ~74.9 GB ~140 GB
Most people use 4-bit quantization (Q4_K_M) which gives 90-95% of full quality at a fraction of the memory. A 24 GB GPU can comfortably run most 7B-13B models.
Estimated: 42.0 tok/s decode · 4.6s TTFT (warm) · 105 tok/s prefill
What limits this setup
This setup is broadly balanced for this model.
Shared-memory contention still exists
The OS, browser, and inference runtime all compete for the same physical memory pool, so real-world headroom is less forgiving than raw capacity suggests.
Best improvement path
Performance by workload
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | B | Runs well | 42.0 tok/s | 2514 ms | 131K |
| Coding | B | Runs well | 42.0 tok/s | 4610 ms | 131K |
| Agentic Coding | B | Runs well | 42.0 tok/s | 6705 ms | 131K |
| Reasoning | B | Runs well | 42.0 tok/s | 5448 ms | 131K |
| RAG | B | Runs well | 42.0 tok/s | 8381 ms | 131K |
Inference speed
Qwen 2.5 3B inference speed — tokens per second by GPU & Mac
Estimated decode speed (tokens/sec) for Qwen 2.5 3B at Q4_K_M across popular GPUs and Apple Silicon, using the fastest local runtime per device. Fastest is RTX 5090 32GB at ~57 tok/s. Speed is memory-bandwidth bound, so cards that fit the whole model in VRAM run far faster than ones that offload to system RAM.
| GPU / Mac | Memory | Quant | Speed (tok/s) | Fits? |
|---|---|---|---|---|
 RTX 5090 32GB | 32 GB | Q4_K_M | 57.0 | Fits |
| RTX 4090 24GB | 24 GB | Q4_K_M | 48.0 | Fits |
| RTX 4080 Super 16GB | 16 GB | Q4_K_M | 48.0 | Fits |
| RTX 4060 8GB | 8 GB | Q4_K_M | 48.0 | Fits |
| RTX 3090 24GB | 24 GB | Q4_K_M | 42.0 | Fits |
| RTX 4070 12GB | 12 GB | Q4_K_M | 42.0 | Fits |
| RTX 3060 12GB | 12 GB | Q4_K_M | 42.0 | Fits |
RX 7900 XTX 24GB | 24 GB | Q4_K_M | 42.0 | Fits |
MacBook Pro M4 Max 128GB | 128 GB | Q4_K_M | 42.0 | Fits |
Mac Studio M3 Ultra 256GB | 256 GB | Q4_K_M | 42.0 | Fits |
Mac Studio M2 Ultra 128GB | 128 GB | Q4_K_M | 42.0 | Fits |
Mac Studio M1 Ultra 128GB | 128 GB | Q4_K_M | 42.0 | Fits |
MacBook Pro M4 Max 64GB | 64 GB | Q4_K_M | 42.0 | Fits |
MacBook Pro M3 Max 64GB | 64 GB | Q4_K_M | 42.0 | Fits |
MacBook Pro M1 Max 64GB | 64 GB | Q4_K_M | 42.0 | Fits |
MacBook Pro M4 Pro 48GB | 48 GB | Q4_K_M | 42.0 | Fits |
Estimates for single-stream decoding at Q4_K_M; real tokens/sec varies with prompt length, context, batch size, and runtime build. Prompt processing (prefill) is faster than the decode figures shown here.
Quantization options
How Qwen 2.5 3B (3B params) fits at each quantization level on NVIDIA DGX Spark 128GB (92.2 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 1.2 GB | Low | B58 |
Q3_K_S | 3 | 1.5 GB | Low | B58 |
NVFP4 | 4 | 1.7 GB | Medium | B58 |
Q4_K_M | 4 | 1.8 GB | Medium | B58 |
Q5_K_M | 5 | 2.2 GB | High | B58 |
Q6_K | 6 | 2.5 GB | High | B58 |
Q8_0 | 8 | 3.2 GB | Very High | B58 |
F16Best for your GPU | 16 | 6.1 GB | Maximum | B58 |
Get started
Copy-paste commands to run Qwen 2.5 3B on your machine.
Run
ollama run qwen2.5:3b升级选项
能流畅运行 Qwen 2.5 3B 的硬件
Frequently asked questions
Can NVIDIA DGX Spark 128GB run Qwen 2.5 3B?
Yes, NVIDIA DGX Spark 128GB can run Qwen 2.5 3B with a B grade (Runs well). Expected decode speed: 42.0 tok/s.
How much VRAM does Qwen 2.5 3B need?
Qwen 2.5 3B (3B parameters) requires approximately 18.3 GB of memory with Q4_K_M quantization.
What is the best quantization for Qwen 2.5 3B?
The recommended quantization for Qwen 2.5 3B is Q4_K_M, which balances quality and memory efficiency.
What speed will Qwen 2.5 3B run at on NVIDIA DGX Spark 128GB?
On NVIDIA DGX Spark 128GB, Qwen 2.5 3B achieves approximately 42.0 tokens per second decode speed with a time-to-first-token of 4610ms using Q4_K_M quantization.
Can NVIDIA DGX Spark 128GB run Qwen 2.5 3B for coding?
For coding workloads, Qwen 2.5 3B on NVIDIA DGX Spark 128GB receives a B grade with 42.0 tok/s and 131K context.
What context window can Qwen 2.5 3B use on NVIDIA DGX Spark 128GB?
On NVIDIA DGX Spark 128GB, Qwen 2.5 3B can safely use up to 131K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.
Is unified memory on NVIDIA DGX Spark 128GB as fast as VRAM for Qwen 2.5 3B?
Not always. NVIDIA DGX Spark 128GB can often fit larger models thanks to unified memory, but a discrete GPU with dedicated high-bandwidth VRAM may still decode faster once the model fits. For this combination, the important distinction is capacity versus sustained throughput.
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