Qwen3.5 122B Q5 VRAM Requirement and Ollama Model Size
Qwen3.5 122B Q5 needs 80GB minimum VRAM, 82GB optimal VRAM, and 128GB+ system RAM for a safer Ollama run. Top-20 curated profile from ollama.com popular list.. Caveat: Estimated values are placeholders unless marked measured..
Hardware Snapshot
| Family | Qwen3.5 |
|---|---|
| Scenario | reasoning |
| License scope | open-source |
| Quantization | Q5 |
| VRAM minimum | 80GB |
| VRAM optimal | 82GB |
| Best local GPU | Cloud-first (no practical single-GPU local) |
| Cloud fallback | H100/H200 class |
| Updated | 2026-02-24 |
| Data status | Verified by Real Hardware |
| Ollama source | Library reference (verified: 2026-02-24) |
| Ollama tag | qwen3.5:122b |
| Popularity | Large Model Watch |
| Category | Reasoning / Large |
Benchmark Anchors
| Hardware | Expected tok/s |
|---|---|
| RTX 3090 24GB | 1.7 |
| RTX 4090 24GB | 2.3 |
| A100 80GB | 4.1 |
Quick Answers
- How much VRAM does Qwen3.5 122B Q5 need?
- Qwen3.5 122B Q5 needs about 80GB minimum VRAM and 82GB optimal VRAM for a safer local run target.
- Can Qwen3.5 122B Q5 run on an RTX 3090 24GB?
- Not as a comfortable local target. Qwen3.5 122B Q5 needs about 80GB minimum and 82GB optimal VRAM, so cloud or larger local GPUs are safer.
- What is the Ollama command for Qwen3.5 122B Q5?
- Use ollama run qwen3.5:122b. Check the Ollama tag qwen3.5:122b before running.
- What is the approximate Ollama model size for Qwen3.5 122B Q5?
- Qwen3.5 122B Q5 uses the qwen3.5:122b Ollama tag. Treat the Q5 122 profile as smaller than the runtime VRAM budget; use 80GB minimum VRAM and 82GB optimal VRAM as the safer sizing numbers.
- How much system RAM does Qwen3.5 122B Q5 need in Ollama?
- Plan for at least 128GB system RAM alongside 80GB minimum VRAM and 82GB optimal VRAM. More RAM helps if layers spill to CPU or if you run multiple models.
- What is the RAM vs VRAM requirement for Qwen3.5 122B Q5?
- Qwen3.5 122B Q5 should be sized by GPU VRAM first: 80GB minimum and 82GB optimal. System RAM should be at least 128GB so Ollama has room for CPU-side layers, context, and the surrounding app process.
- What is Qwen3.5 122B Q5 VRAM usage on an RTX 3090?
- Qwen3.5 122B Q5 is not recommended for an RTX 3090 24GB target. The page estimates 80GB minimum and 82GB optimal VRAM, with spill risk marked as high without a larger GPU or cloud.
- Which LocalVRAM profiles share the qwen3.5:122b Ollama tag?
- LocalVRAM tracks these profiles for the same Ollama tag or model family: Qwen3.5 122B Q5 (Q5, 80GB min/82GB optimal); Qwen3.5 122B Q4 (Q4, 70GB min/80GB optimal); Qwen3.5 122B Q8 (Q8, 144GB min/154GB optimal); Qwen3.5 122B FP16 (FP16, 150GB min/162GB optimal). Use the table on this page to compare quantization and VRAM targets before choosing a run command.
- Is Qwen3.5 122B Q5 benchmark data measured or estimated?
- Qwen3.5 122B Q5 has a verified RTX 3090 result of 4.931 tokens/s from LocalVRAM benchmark data.
Ollama Model Size and RAM Notes
| Ollama tag | qwen3.5:122b |
|---|---|
| Run command | ollama run qwen3.5:122b |
| Model size guidance | Q5 quantization, 122 profile; size runtime by VRAM, not download size alone |
| Runtime VRAM target | 80GB minimum, 82GB optimal |
| System RAM planning | 128GB or more when running this tag locally with Ollama |
Download size alone is not a safe runtime budget. Runtime memory also includes KV cache, context length, and GPU layer placement.
Ollama RAM vs VRAM Requirements
| GPU VRAM usage estimate | 80GB minimum / 82GB optimal |
|---|---|
| System RAM requirement | 128GB or more for Ollama runtime headroom |
| RTX 3090 24GB fit | Not recommended |
| CPU spill risk | High without larger GPU or cloud |
| Context warning | Longer context increases KV cache memory, so real VRAM usage can exceed short-prompt estimates. |
For Ollama, VRAM is the first fit check. System RAM matters when layers spill to CPU, when context grows, or when the local app stack runs beside the model.
Available Tag Variants and VRAM Targets
| Profile | Quantization | VRAM target | Ollama tag |
|---|---|---|---|
| Qwen3.5 122B Q5 | Q5 | 80GB min / 82GB optimal | qwen3.5:122b |
| Qwen3.5 122B Q4 | Q4 | 70GB min / 80GB optimal | qwen3.5:122b |
| Qwen3.5 122B Q8 | Q8 | 144GB min / 154GB optimal | qwen3.5:122b |
| Qwen3.5 122B FP16 | FP16 | 150GB min / 162GB optimal | qwen3.5:122b |
Ollama library tags often group multiple quantization choices under one model family. LocalVRAM separates them into VRAM profiles so you can pick the right local target.
Real Hardware Benchmark (RTX 3090)
| Tokens/s | 4.931 |
|---|---|
| Latency | 11915 ms |
| Prompt tokens | 31 |
| Eval tokens | 48 |
| Test time | 2026-02-26T19:19:16Z |
| GPU model | NVIDIA GeForce RTX 3090 |
Verified by real hardware.
Performance Curve
Reference anchors are baseline estimates. Measured RTX 3090 data is overlaid when available.
Best Hardware for Qwen3.5 122B Q5
- Local run: RTX 3090 (24GB) (Check latest deal) for around 4.931 tok/s on this profile.
- Cloud run: RunPod H100/H200 class , about 0.8x the local 3090 speed anchor.
- Alternative cloud: Vast.ai options for flexible spot pricing.
Local vs Cloud Cost Hint
| Mode | 40h / month | 120h / month |
|---|---|---|
| Local power only (3090 baseline) | $2.24 | $6.72 |
| H100/H200 class | $196 | $588 |
Related Model Profiles
- Qwen3.5 122B Q4 70GB min, 80GB optimal
- Qwen3.5 122B Q8 144GB min, 154GB optimal
- Qwen3.5 122B FP16 150GB min, 162GB optimal
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