Can Qwen3.5 35B A3B run on AMD Instinct MI250 128GB?

YES — Runs Great

C49Usable

Estimated from fit model

Qwen3.5 35B A3B needs ~39.2 GB VRAM. AMD Instinct MI250 128GB has 128.0 GB. With Q4_K_M quantization, expect ~102 tok/s.

Runtime: llama.cppCapacity: RoomyBandwidth: HighStack: StandardBottleneck: Balanced

Operating mode

Choose the run profile you care about

Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.

Current mode

Balanced

Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.

Capabilities:

Select quantization to explore

Q4_K_M (Medium quality) — 39.2 GB, 101.9 tok/s, Runs well

39.2 GB required128.0 GB available

31% VRAM used

Fit status

Runs well

Decode

101.9 tok/s

TTFT

1900 ms

Safe context

363K

Memory

39.2 GB / 128.0 GB

Memory breakdown

Weights21.3 GB

KV Cache4.1 GB

Runtime0.9 GB

Headroom12.8 GB

See how fast it feels

See how fast it feelsQwen3.5 35B A3B on AMD Instinct MI250 128GB
1st promptCold start — includes initialization
>What is local AI inference?
Local AI inference means running an AI language model directly on your own hardware — your laptop, desktop, or server — instead of sending requests to a remote cloud API.

When you run inference locally the model weights are loaded into your GPU or unified memory. Each token you generate requires reading those weights from memory, so memory bandwidth is the main bottleneck for decode speed.

Key benefits of running locally:
  - Full privacy: your prompts never leave your machine
  - No per-token cost or rate limits
  - Works offline once the model is downloaded
  - Latency depends only on your hardware
2nd promptWarm — model ready, no init overhead
>How much VRAM do I need?
It depends on the model size and quantization level. A rough rule of thumb:

  Model size     Q4 (4-bit)    Q8 (8-bit)    FP16
  7B params      ~4.3 GB       ~7.5 GB       ~14 GB
  13B params     ~7.9 GB       ~13.9 GB      ~26 GB
  70B params     ~42.7 GB      ~74.9 GB      ~140 GB

Most people use 4-bit quantization (Q4_K_M) which gives 90-95% of full quality at a fraction of the memory. A 24 GB GPU can comfortably run most 7B-13B models.
Estimated: 101.9 tok/s decode · 1.9s TTFT (warm) · 255 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

No major red flags

This recommendation has enough memory headroom and acceptable estimated speed for the selected workload.

Best improvement path

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	C	Runs well	101.9 tok/s	1036 ms	363K
Coding	C	Runs well	101.9 tok/s	1900 ms	363K
Agentic Coding	C	Runs well	101.9 tok/s	2763 ms	363K
Reasoning	C	Runs well	101.9 tok/s	2245 ms	363K
RAG	C	Runs well	101.9 tok/s	3454 ms	363K

Quantization options

How Qwen3.5 35B A3B (35B params) fits at each quantization level on AMD Instinct MI250 128GB (128.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	13.7 GB	Low	D39
Q3_K_S	3	17.2 GB	Low	D39
NVFP4	4	19.6 GB	Medium	D39
Q4_K_M	4	21.3 GB	Medium	D39
Q5_K_M	5	25.2 GB	High	D40
Q6_K	6	28.7 GB	High	C40
Q8_0	8	37.5 GB	Very High	C42
F16Best for your GPU	16	71.8 GB	Maximum	C48

Get started

Copy-paste commands to run Qwen3.5 35B A3B on your machine.

Run

docker run --rm -it ghcr.io/ggerganov/llama.cpp:full \
  --hf-repo "lmstudio-community/Qwen3.5-35B-A3B-GGUF" \
  --hf-file "Qwen3.5-35B-A3B-GGUF-Q4_K_M.gguf" \
  -c 4096 -ngl 99

Frequently asked questions

Can AMD Instinct MI250 128GB run Qwen3.5 35B A3B?

Yes, AMD Instinct MI250 128GB can run Qwen3.5 35B A3B with a C grade (Runs well). Expected decode speed: 101.9 tok/s.

How much VRAM does Qwen3.5 35B A3B need?

Qwen3.5 35B A3B (35B parameters) requires approximately 39.2 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen3.5 35B A3B?

The recommended quantization for Qwen3.5 35B A3B is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen3.5 35B A3B run at on AMD Instinct MI250 128GB?

On AMD Instinct MI250 128GB, Qwen3.5 35B A3B achieves approximately 101.9 tokens per second decode speed with a time-to-first-token of 1900ms using Q4_K_M quantization.

Can AMD Instinct MI250 128GB run Qwen3.5 35B A3B for coding?

For coding workloads, Qwen3.5 35B A3B on AMD Instinct MI250 128GB receives a C grade with 101.9 tok/s and 363K context.

What context window can Qwen3.5 35B A3B use on AMD Instinct MI250 128GB?

On AMD Instinct MI250 128GB, Qwen3.5 35B A3B can safely use up to 363K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

See all results for AMD Instinct MI250 128GB See all hardware for Qwen3.5 35B A3B

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