Can I run Qwen3.5 27B on the GeForce RTX 5070?
Runs slowlyQ4_K_M does not fit fully in VRAM, so 6.8 GB of the weights run from system RAM: Runs slowly, est. 5.6 tok/s (4.5–6.7, calibrated estimate ±20%).
12 GB VRAM · 672.0 GB/s · FP16 30.9 TFLOPS. Assumes 32 GB of DDR5-5600 system RAM, Windows with this GPU driving the display, 8k context and an f16 KV cache. The verdict and quant file above stay the same anywhere from 16 to 128 GB of system RAM. The GeForce RTX 5070 Ti Laptop has the same memory setup (12 GB, 672.0 GB/s), so its generation-speed estimate is the same; only prompt processing differs.
Every quant of Qwen3.5 27B on the GeForce RTX 5070
| Quant | File size | Verdict | Speed | Memory | Runs as | Notes |
|---|---|---|---|---|---|---|
| UD-Q2_K_XL | 12.04 GB | Runs slowly | est. 15.7 tok/s12.6–18.8calibrated estimate ±20% | 12.0 / 12.0 GB + 1.8 GB RAM | Partial offload | Less than 90% on the GPU — a GPU/CPU split is capped at Runs slowly |
| IQ4_XS | 15.71 GB | Runs slowly | est. 6.8 tok/s5.4–8.1calibrated estimate ±20% | 12.0 / 12.0 GB + 5.4 GB RAM | Partial offload | — |
| Q4_K_Mbaseline | 17.11 GB | Runs slowly | est. 5.6 tok/s4.5–6.7calibrated estimate ±20% | 12.0 / 12.0 GB + 6.8 GB RAM | Partial offload | — |
| Q8_0 | 29.05 GB | Won't run | est. 2.2 tok/s1.8–2.7calibrated estimate ±20% | 12.0 / 12.0 GB + 18.8 GB RAM | Partial offload | Fits, but too slow to use |
Models with a thinking mode spend extra tokens thinking, so their speed thresholds are 1.5× stricter (30 / 12 / 3 tok/s). With thinking turned off, a model may do one grade better.
Where the memory goes at Q4_K_M
- Weights
- 10.3 GB
- KV cache
- 0.5 GB
- Compute buffer
- 0.6 GB
- OS reserve
- 0.6 GB
- Weights in system RAM
- 6.8 GB
Context length vs. KV cache
| Context | KV f16 | KV q8_0 | KV q4_0 |
|---|---|---|---|
| 4k | 16.9 GBRuns slowly est. 5.9 tok/s4.7–7.0calibrated estimate ±20% | 16.8 GBRuns slowly est. 6.0 tok/s4.8–7.2calibrated estimate ±20% | 16.7 GBRuns slowly est. 6.1 tok/s4.9–7.3calibrated estimate ±20% |
| 8k | 17.2 GBRuns slowly est. 5.6 tok/s4.5–6.7calibrated estimate ±20% | 17.0 GBRuns slowly est. 5.8 tok/s4.7–7.0calibrated estimate ±20% | 16.8 GBRuns slowly est. 6.0 tok/s4.8–7.1calibrated estimate ±20% |
| 16k | 17.8 GBRuns slowly est. 5.0 tok/s4.0–6.1calibrated estimate ±20% | 17.3 GBRuns slowly est. 5.5 tok/s4.4–6.6calibrated estimate ±20% | 17.0 GBRuns slowly est. 5.7 tok/s4.6–6.9calibrated estimate ±20% |
| 32k | 19.0 GBRuns slowly est. 4.2 tok/s3.4–5.0calibrated estimate ±20% | 18.0 GBRuns slowly est. 4.9 tok/s3.9–5.9calibrated estimate ±20% | 17.5 GBRuns slowly est. 5.4 tok/s4.3–6.4calibrated estimate ±20% |
| 64k | 21.5 GBRuns slowly est. 3.1 tok/s2.5–3.7calibrated estimate ±20% | 19.5 GBRuns slowly est. 4.0 tok/s3.2–4.8calibrated estimate ±20% | 18.4 GBRuns slowly est. 4.7 tok/s3.8–5.6calibrated estimate ±20% |
| 128k | 26.4 GBWon't run est. 1.9 tok/s1.5–2.2calibrated estimate ±20% | 22.4 GBWon't run est. 2.8 tok/s2.3–3.4calibrated estimate ±20% | 20.2 GBRuns slowly est. 3.7 tok/s3.0–4.5calibrated estimate ±20% |
| 256k | 36.2 GBdoes not fit | 26.3 GBWon't run est. 1.7 tok/s1.4–2.0calibrated estimate ±20% | 23.9 GBWon't run est. 2.5 tok/s2.0–3.0calibrated estimate ±20% |
S = Runs great · A = Runs well · B = Runs slowly · F = Won't run
At Q4_K_M the verdict stays Runs slowly up to 64k context with an f16 KV cache, and up to 64k with q8_0.
Estimated speed
- Generation
- est. 5.6 tok/s (4.5–6.7, calibrated estimate ±20%)
- Prompt processing
- Prompt-processing estimates only apply when the whole model runs on the GPU.
Measured on this exact combination
No public measurement for this exact combination yet; the numbers above are estimates.
If this is not enough
A smaller model that runs well on the GeForce RTX 5070
Runs wellGemma 4 26B-A4B: Runs well, est. 53.6 tok/s (37.5–69.7, theoretical estimate ±30%)
Cheapest GPU that runs Qwen3.5 27B great
Runs greatGeForce RTX 3090 — $1,050 street (as of 2026-08-09): est. 37.1 tok/s (32.7–41.6, calibrated estimate ±12%).
How to run it
Commands for the Q4_K_M file. Both tools download from Hugging Face on first run.
File: Qwen3.5-27B-Q4_K_M.gguf (17.11 GB) from unsloth/Qwen3.5-27B-MTP-GGUF.
llama-server -hf unsloth/Qwen3.5-27B-MTP-GGUF:Q4_K_M -c 8192 -ngl 38 -fa on- -ngl 38 puts 38 of 64 layers on the GPU; if VRAM overflows, lower it by 1–2.
- -fa on enables flash attention (needed for KV cache quantization).
- --cache-type-k q8_0 --cache-type-v q8_0 shrinks the KV cache to 0.29 GB at 8k context.
PowerShell (quit the Ollama tray app first):
$env:OLLAMA_CONTEXT_LENGTH="8192"; ollama serve
ollama run hf.co/unsloth/Qwen3.5-27B-MTP-GGUF:Q4_K_M- Ollama defaults to 4k context on GPUs under 24 GB. Set OLLAMA_CONTEXT_LENGTH when starting the server, or /set parameter num_ctx inside the chat.
- Ollama splits layers between GPU and CPU automatically.
/set parameter num_ctx 8192
Related pages
Guide: How much VRAM do local LLMs need? GPU requirements for 8–32 GB (2026)
Other models on the GeForce RTX 5070
Qwen3.5 27B on other hardware
Frequently asked questions
Can I run Qwen3.5 27B on the GeForce RTX 5070?
Q4_K_M does not fit fully in VRAM, so 6.8 GB of the weights run from system RAM: Runs slowly, est. 5.6 tok/s (4.5–6.7, calibrated estimate ±20%). Q4_K_M needs 17.2 GB at 8k context; this setup has 11.4 GB of usable memory and 28.0 GB of free system RAM.
How much context can Qwen3.5 27B use on the GeForce RTX 5070?
At Q4_K_M the verdict stays Runs slowly up to 64k context with an f16 KV cache (4.3 GB of KV) and up to 64k with a q8_0 KV cache (2.3 GB). The model supports up to 256k.
Which quant should I use, and how fast is it?
Q4_K_M (17.11 GB) is the recommended balance: Runs slowly, est. 5.6 tok/s (4.5–6.7, calibrated estimate ±20%). It is also the largest tracked file that gets this verdict.
Speeds are estimates from memory bandwidth, calibrated against public benchmarks, and each one comes with an error band and a confidence label. Real results vary with drivers, backend, context length and thermals.