Can I Run Qwen 3.5 on NVIDIA DGX Spark?
Written by Jakub Rusinowski · Last updated July 21, 2026
Yes, comfortably — Qwen 3.5 122B-A10B at Q4_K_M needs 77.3 GB at 8K context (73.7 GB weights + 3.6 GB KV cache/overhead), leaving ~50.7 GB of the NVIDIA DGX Spark's 128 GB, at ~29 tok/s (est.), with room for up to 128K context.
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NVIDIA DGX Spark Specs
| VRAM | 128 GB |
| Memory Bandwidth | 273 GB/s |
Qwen 3.5 122B-A10B on the NVIDIA DGX Spark: VRAM by quantization
| Quant | VRAM needed | Fits 128 GB? | Max context | Whole PC |
|---|---|---|---|---|
| F16 | 247.7 GB | ✗ No | — | — |
| Q8_0 | 133.3 GB | ✗ No | — | — |
| Q6_K | 103.7 GB | ✓ Yes | 64K | — |
| Q5_K_M | 90.1 GB | ✓ Yes | 64K | — |
| Q4_K_M | 77.3 GB | ✓ Yes | 128K | — |
| Q3_K_M | 55.7 GB | ✓ Yes | 128K | — |
| Q2_K | 43.8 GB | ✓ Yes | 128K | — |
Assumes an 8K-token context with an f16 KV cache, on an estimated architecture — this model publishes no config we can read. A longer window needs more; a quantized KV cache needs less. “Max context” is the largest window that still fits in 128 GB. Figures are estimates from parameter count, quantization and memory bandwidth — the analyzer lets you tune KV-cache quant and context.
Context costs VRAM too. At Q4_K_M on the NVIDIA DGX Spark: 8K 77.3 GB · 32K 85.9 GB · 128K 120.1 GB. Every window this model publishes still fits 128 GB.
No compatible GPU? Qwen 3.5 122B-A10B on 128 GB of system RAM, CPU only: runs.
Qwen 3.5 Sizes That Fit the NVIDIA DGX Spark (at 8K context)
| Qwen 3.5 122B-A10B | Q4_K_M · 77.3 GB at 8K context · ~29 tok/s (est.) |
| Qwen 3.5 35B-A3B | Q4_K_M · 23.8 GB at 8K context · ~71 tok/s (est.) |
| Qwen 3.5 27B | Q4_K_M · 18.8 GB at 8K context · ~13 tok/s (est.) |
| Qwen 3.5 9B | Q4_K_M · 6.5 GB at 8K context · ~38 tok/s (est.) |
| Qwen 3.5 4B | Q4_K_M · 3.5 GB at 8K context · ~76 tok/s (est.) |
| Qwen 3.5 2B | Q4_K_M · 2.7 GB at 8K context · ~111 tok/s (est.) |
| Qwen 3.5 0.8B | Q4_K_M · 1.8 GB at 8K context · ~182 tok/s (est.) |
At 2 hrs/day, buying (~$4,699) beats renting at $0.77/hr after about 8.5 years.
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Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.
FAQ
Does the NVIDIA DGX Spark have enough VRAM for Qwen 3.5?
Yes, comfortably — Qwen 3.5 122B-A10B at Q4_K_M needs 77.3 GB at 8K context (73.7 GB weights + 3.6 GB KV cache/overhead), leaving ~50.7 GB of the NVIDIA DGX Spark's 128 GB, at ~29 tok/s (est.), with room for up to 128K context.
Which quantization of Qwen 3.5 should I use on the NVIDIA DGX Spark?
Qwen 3.5 122B-A10B at Q4_K_M quantization needs 77.3 GB at 8K context (73.7 GB weights + 3.6 GB KV cache/overhead), estimated ~29 tokens/sec, up to 128K context.
Every Qwen 3.5 size on the NVIDIA DGX Spark
| Size | VRAM at 8K | Verdict | Speed |
|---|---|---|---|
| Qwen 3.5 397B-A17B | 139 GB | Does not fit | — |
| Qwen 3.5 122B-A10B | 77.3 GB | Runs | ~29 tok/s |
| Qwen 3.5 35B-A3B | 23.8 GB | Runs | ~71 tok/s |
| Qwen 3.5 27B | 18.8 GB | Runs | ~13 tok/s |
| Qwen 3.5 9B | 6.5 GB | Runs | ~38 tok/s |
| Qwen 3.5 4B | 3.5 GB | Runs | ~76 tok/s |
| Qwen 3.5 2B | 2.7 GB | Runs | ~111 tok/s |
| Qwen 3.5 0.8B | 1.8 GB | Runs | ~182 tok/s |
Qwen 3.5 on Other GPUs
- Qwen 3.5 on Apple M4 Max
- Qwen 3.5 on Apple M1 Ultra
- Qwen 3.5 on Apple M5 Max
- Qwen 3.5 on AMD Ryzen AI Max+ 395
Popular Models on the NVIDIA DGX Spark
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