NVIDIA GB10 Grace Blackwell
NVIDIA's desktop AI chip, used in the DGX Spark and in GB10 machines from ASUS, Dell, HP, Lenovo, MSI, Acer and Gigabyte. Its memory bandwidth is close to AMD's Ryzen AI Max+ 395, so writing speed is similar; its advantage is NVIDIA's CUDA software stack, which most AI research and development tools target first.
Specifications
- Processor
- 20 Arm cores (10 Cortex-X925 + 10 Cortex-A725)
- Graphics
- Blackwell GPU with 5th-generation Tensor Cores
- AI performance
- Up to 1 PFLOP FP4 (with sparsity)
- Memory
- 256-bit LPDDR5X, coherent unified memory, up to 128 GB
- Memory bandwidth
- 273 GB/s (theoretical peak)
What it can run with 128 GB
Estimated writing speed with an 8K-token conversation. Estimates, not our tests; see how we estimate.
| Model (4-bit) | Tokens/s |
|---|---|
| Gemma 4 E4B 4.59 GB | 48-62 |
| Llama 3.1 8B 4.92 GB | 31-41 |
| Qwen3.5 9B 5.68 GB | 31-40 |
| Gemma 4 12B 7.12 GB | 23-30 |
| gpt-oss 20B 12.11 GB | 61-79 |
| Qwen3.8 27B 16.46 GB | 10-13 |
| Qwen3 Coder 30B-A3B 18.56 GB | 70-91 |
| Qwen3.6 35B-A3B 22.13 GB | 60-77 |
| Llama 3.3 70B 42.52 GB | 4-5 |
| gpt-oss 120B 63.39 GB | 43-56 |
Machines with the NVIDIA GB10 Grace Blackwell
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| Machine | Memory | Bandwidth | NPU | Price | Status | Store |
|---|---|---|---|---|---|---|
| NVIDIA DGX Spark 20-core Arm (10 Cortex-X925 + 10 Cortex-A725) | 128 GB unified | 273 GB/s | None | $4,699list price | Researched, not tested | Check Amazon |
Sources
- NVIDIA DGX Spark specifications, checked Sep 25, 2026