Hardware profile
Current generationNVIDIA DGX Spark · 128 GB
128 GB shared CPU/GPU memory · 273 GB/s · verified
This compact AI system uses unified system memory for CPU and GPU work. It is not a conventional add-in GPU, and runtime support must be checked for the exact software stack.
Recommended quantization by model
This table chooses the highest-quality published quantization that still clears the selected 8K context estimate. It does not compare output quality or claim that every backend has the same kernels.
| Model | Recommended quantization | Estimated requirement | Context ceiling | Result |
|---|---|---|---|---|
| Flint 40B | Q8_0 | 44.0 GB at 8K | 262,144 tokens | Comfortable fit |
| NVIDIA Nemotron 3.5 Bolt E4B | Q4_K_M | 8.0 GB at 8K | 65,536 tokens | Comfortable fit |
| LFM3-1.7B | Q8_0 | 3.4 GB at 8K | 262,144 tokens | Comfortable fit |
| Bonsai 2 | PQ2_0 | 9.2 GB at 8K | 262,144 tokens | Comfortable fit |
| Qwen3.8 27B | Q8_0 | 32.0 GB at 8K | 262,144 tokens | Comfortable fit |
| Gemma 4 12B Unified | Q8_0 | 14.7 GB at 8K | 262,144 tokens | Comfortable fit |
| Gemma 4 E4B | Q8_0 | 11.0 GB at 8K | 131,072 tokens | Comfortable fit |
| gpt-oss-20b | MXFP4 | 13.8 GB at 8K | 131,072 tokens | Comfortable fit |
| Qwen3.6 35B-A3B | Q8_0 | 39.5 GB at 8K | 262,144 tokens | Comfortable fit |
| Gemma 4 31B | Q8_0 | 36.5 GB at 8K | 262,144 tokens | Comfortable fit |
| gpt-oss-120b | MXFP4 | 65.2 GB at 8K | 131,072 tokens | Comfortable fit |
| Qwen3 8B | Q8_0 | 11.6 GB at 8K | 32,768 tokens | Comfortable fit |
| DeepSeek R1 8B | Q8_0 | 11.1 GB at 8K | 131,072 tokens | Comfortable fit |
| Llama 3.2 3B | Q8_0 | 5.8 GB at 8K | 131,072 tokens | Comfortable fit |
| Phi-4 Mini | Q8_0 | 6.7 GB at 8K | 131,072 tokens | Comfortable fit |
| Mistral 7B | Q8_0 | 10.3 GB at 8K | 32,768 tokens | Comfortable fit |
| Gemma 3 4B | Q8_0 | 7.6 GB at 8K | 131,072 tokens | Comfortable fit |
Per-quantization fit for recent models
These are the five most relevant non-server models plus the next current model in the catalog. Each row uses the same 8K formula, so changing a quantization or context length produces an arithmetic result rather than a new benchmark claim.
| Model | Quantization | Weight files | 8K requirement | Result | 8K context ceiling | Speed band | Ollama |
|---|---|---|---|---|---|---|---|
| Flint 40B | UD-IQ1_M | 11.35 GB | 13.1 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| Flint 40B | UD-IQ2_XXS | 11.86 GB | 13.6 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| Flint 40B | UD-Q2_K_XL | 13.56 GB | 15.3 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| Flint 40B | UD-IQ3_XXS | 14.54 GB | 16.3 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| Flint 40B | UD-Q3_K_XL | 18.49 GB | 20.2 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| Flint 40B | NVFP4 | 22.86 GB | 24.6 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | ollama run flint:40b |
| Flint 40B | UD-Q4_K_XL | 25.05 GB | 26.8 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| Flint 40B | UD-Q5_K_XL | 29.92 GB | 31.7 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| Flint 40B | UD-Q6_K_XL | 36.32 GB | 38.1 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| Flint 40B | Q8_0 | 42.30 GB | 44.0 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| NVIDIA Nemotron 3.5 Bolt E4B | Q4_K_M | 6.18 GB | 8.0 GB | Comfortable fit | 65,536 tokens | Estimate · Fast relative band | ollama run nemotron-3.5-bolt:e4b |
| LFM3-1.7B | QAD-Q4_0 | 1.05 GB | 2.7 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | ollama run lfm3:1.7b-qad-q4_0 |
| LFM3-1.7B | Q4_K_M | 1.10 GB | 2.7 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | ollama run lfm3:1.7b-q4_K_M |
| LFM3-1.7B | Q5_K_M | 1.26 GB | 2.9 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| LFM3-1.7B | Q6_K | 1.43 GB | 3.0 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | No verified tag |
| LFM3-1.7B | Q8_0 | 1.85 GB | 3.4 GB | Comfortable fit | 262,144 tokens | Estimate · Very fast relative band | ollama run lfm3:1.7b-q8_0 |
| Bonsai 2 | PTQ1_0 | 5.95 GB | 8.0 GB | Comfortable fit | 262,144 tokens | Estimate · Slow relative band | No verified tag |
| Bonsai 2 | PQ2_0 | 7.21 GB | 9.2 GB | Comfortable fit | 262,144 tokens | Estimate · Slow relative band | No verified tag |
| Bonsai 2 | Q2_0 | 7.63 GB | 9.7 GB | Comfortable fit | 262,144 tokens | Estimate · Slow relative band | ollama run bonsai-2:27b-q2_0 |
| Qwen3.8 27B | Q4_K_M | 17.39 GB | 19.4 GB | Comfortable fit | 262,144 tokens | Estimate · Slow relative band | ollama run qwen3.8:27b-q4_K_M |
| Qwen3.8 27B | Q8_0 | 29.98 GB | 32.0 GB | Comfortable fit | 262,144 tokens | Estimate · Slow relative band | ollama run qwen3.8:27b-q8_0 |
| Gemma 4 12B Unified | Q4_0 | 7.15 GB | 9.1 GB | Comfortable fit | 262,144 tokens | Estimate · Moderate relative band | ollama run gemma4:12b-it-qat |
| Gemma 4 12B Unified | Q4_K_M | 7.30 GB | 9.2 GB | Comfortable fit | 262,144 tokens | Estimate · Moderate relative band | ollama run gemma4:12b-it-q4_K_M |
| Gemma 4 12B Unified | Q8_0 | 12.85 GB | 14.7 GB | Comfortable fit | 262,144 tokens | Estimate · Moderate relative band | ollama run gemma4:12b-it-q8_0 |
Speed bands are relative heuristics, not measured tokens per second. Verify the package name, license, backend support, and free memory before relying on a result.
Why this memory result is not a guarantee
NVIDIA DGX Spark · 128 GB has 128 GB of shared CPU/GPU memory. The formula subtracts weight files, KV cache, and 1.5 GB of runtime overhead, then requires 20% remaining headroom for a comfortable result. Driver reservations, display buffers, other applications, longer prompts, concurrent requests, and backend-specific workspace can all reduce the usable budget.
Shared-memory AI systems may expose less memory to the GPU than the installed total. Treat 128 GB as an upper bound and verify the firmware allocation for the exact model and operating system.
Low-cost setup upgrades
Useful accessories around NVIDIA DGX Spark · 128 GB
These optional setup upgrades address storage, cooling, or power resilience. None increases GPU or unified-memory capacity.
External NVMe SSD for model storage
Keeps large GGUF and MLX files off the boot drive. Fast storage reduces load time, but it does not increase the memory available for inference.
Search current listings on AmazonDesktop RAM upgrade kit
Useful for MoE CPU offload and keeping the operating system out of VRAM. Match the motherboard's memory type, slot layout, capacity limit, and validated part numbers.
Search current listings on AmazonGPU support bracket
A lower-cost mechanical upgrade for heavy three-slot cards. Check clearance, mounting height, and whether the bracket blocks fans or case panels.
Search current listings on AmazonAs an Amazon Associate I earn from qualifying purchases. Links are sponsored search links and do not change the price you pay. Affiliate disclosure.
Specific model checks
Compare current hardware
The closest current-generation profiles by memory capacity are below. A higher tier can increase the context ceiling or make a larger quantization comfortable, but it does not automatically guarantee faster generation.
Sources and verification
Data reviewed . Check the linked vendor material for the exact configuration before buying or installing.
FAQ
Questions about NVIDIA DGX Spark · 128 GB.
How much shared CPU/GPU memory does NVIDIA DGX Spark · 128 GB provide for local AI?
NVIDIA DGX Spark · 128 GB is listed with 128 GB of shared CPU/GPU memory and 273 GB/s of memory bandwidth. The operating system, display buffers, and other applications share that capacity, so the model budget is always lower than the bare hardware number.
Which current local models fit comfortably on NVIDIA DGX Spark · 128 GB?
Flint 40B, NVIDIA Nemotron 3.5 Bolt E4B, LFM3-1.7B. Comfortable means the 8K estimate leaves at least 20% headroom after weights, KV cache, and runtime overhead. A larger or higher-quality quantization may move an individual result into the tight band.
What context length can gpt-oss-120b at MXFP4 use on this machine?
At the selected quantization, the formula reaches 131,072 tokens before the machine's 128 GB capacity is exhausted. The model's native context limit still caps the result, and real workloads may run out earlier because of fragmentation, other applications, or backend workspace.
Is the 273 GB/s bandwidth figure a measured token speed?
No. Fast relative band is a relative estimate based on active parameters and memory bandwidth. It is not a benchmark: backend kernels, batch size, thermals, CPU offload, and concurrent work can change real generation speed substantially.
What should I do if a model does not fit on NVIDIA DGX Spark · 128 GB?
Try a lower-bit published quantization and a shorter context first. If the minimum requirement still exceeds 128 GB, the arithmetic gap to a 20% comfort target is not available until a model exceeds this capacity. Compare another current hardware profile with more memory before upgrading.