Can Qwen3.5 27B run on AMD Instinct MI325X 256GB?

YES — Runs Great

C46Usable

Estimated from fit model

Qwen3.5 27B needs ~46.1 GB VRAM. AMD Instinct MI325X 256GB has 256.0 GB. With Q4_K_M quantization, expect ~266 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) — 46.1 GB, 265.9 tok/s, Runs well

46.1 GB required256.0 GB available

18% VRAM used

Fit status

Runs well

Decode

265.9 tok/s

TTFT

728 ms

Safe context

1.1M

Memory

46.1 GB / 256.0 GB

Memory breakdown

Weights16.5 GB

KV Cache3.2 GB

Runtime0.9 GB

Headroom25.6 GB

See how fast it feels

See how fast it feelsQwen3.5 27B on AMD Instinct MI325X 256GB
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: 265.9 tok/s decode · 728ms TTFT (warm) · 665 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	265.9 tok/s	397 ms	1.1M
Coding	C	Runs well	265.9 tok/s	728 ms	1.1M
Agentic Coding	C	Runs well	265.9 tok/s	1059 ms	1.1M
Reasoning	C	Runs well	265.9 tok/s	860 ms	1.1M
RAG	C	Runs well	265.9 tok/s	1324 ms	1.1M

Quantization options

How Qwen3.5 27B (27B params) fits at each quantization level on AMD Instinct MI325X 256GB (256.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	10.5 GB	Low	D37
Q3_K_S	3	13.2 GB	Low	D37
NVFP4	4	15.1 GB	Medium	D37
Q4_K_M	4	16.5 GB	Medium	D37
Q5_K_M	5	19.4 GB	High	D37
Q6_K	6	22.1 GB	High	D37
Q8_0	8	28.9 GB	Very High	D38
F16Best for your GPU	16	55.4 GB	Maximum	C40

Get started

Copy-paste commands to run Qwen3.5 27B on your machine.

Run

docker run --rm -it ghcr.io/ggerganov/llama.cpp:full \
  --hf-repo "unsloth/Qwen3.5-27B-GGUF" \
  --hf-file "Qwen3.5-27B-GGUF-Q4_K_M.gguf" \
  -c 4096 -ngl 99

Frequently asked questions

Can AMD Instinct MI325X 256GB run Qwen3.5 27B?

Yes, AMD Instinct MI325X 256GB can run Qwen3.5 27B with a C grade (Runs well). Expected decode speed: 265.9 tok/s.

How much VRAM does Qwen3.5 27B need?

Qwen3.5 27B (27B parameters) requires approximately 46.1 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen3.5 27B?

The recommended quantization for Qwen3.5 27B is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen3.5 27B run at on AMD Instinct MI325X 256GB?

On AMD Instinct MI325X 256GB, Qwen3.5 27B achieves approximately 265.9 tokens per second decode speed with a time-to-first-token of 728ms using Q4_K_M quantization.

Can AMD Instinct MI325X 256GB run Qwen3.5 27B for coding?

For coding workloads, Qwen3.5 27B on AMD Instinct MI325X 256GB receives a C grade with 265.9 tok/s and 1.1M context.

What context window can Qwen3.5 27B use on AMD Instinct MI325X 256GB?

On AMD Instinct MI325X 256GB, Qwen3.5 27B can safely use up to 1.1M tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

See all results for AMD Instinct MI325X 256GB See all hardware for Qwen3.5 27B

Embed this result▼

Paste this snippet into any page to show a live fit card.

<iframe src="https://willitrunai.com/embed/hf-unsloth--qwen3-5-27b-gguf-on-instinct-mi325x-256gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>

Preview:

Workload

Grade

Fit

Decode

TTFT

Context

Chat

Runs well

265.9 tok/s

397 ms

1.1M

Coding

Runs well

265.9 tok/s

728 ms

1.1M

Agentic Coding

Runs well

265.9 tok/s

1059 ms

1.1M

Reasoning

Runs well

265.9 tok/s

860 ms

1.1M

RAG

Runs well

265.9 tok/s

1324 ms

1.1M

Quantization options

How Qwen3.5 27B (27B params) fits at each quantization level on AMD Instinct MI325X 256GB (256.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	10.5 GB	Low	D37
Q3_K_S	3	13.2 GB	Low	D37
NVFP4	4	15.1 GB	Medium	D37
Q4_K_M	4	16.5 GB	Medium	D37
Q5_K_M	5	19.4 GB	High	D37
Q6_K	6	22.1 GB	High	D37
Q8_0	8	28.9 GB	Very High	D38
F16Best for your GPU	16	55.4 GB	Maximum	C40

Frequently asked questions

Can AMD Instinct MI325X 256GB run Qwen3.5 27B?

Yes, AMD Instinct MI325X 256GB can run Qwen3.5 27B with a C grade (Runs well). Expected decode speed: 265.9 tok/s.

How much VRAM does Qwen3.5 27B need?

Qwen3.5 27B (27B parameters) requires approximately 46.1 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen3.5 27B?

The recommended quantization for Qwen3.5 27B is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen3.5 27B run at on AMD Instinct MI325X 256GB?

On AMD Instinct MI325X 256GB, Qwen3.5 27B achieves approximately 265.9 tokens per second decode speed with a time-to-first-token of 728ms using Q4_K_M quantization.

Can AMD Instinct MI325X 256GB run Qwen3.5 27B for coding?

For coding workloads, Qwen3.5 27B on AMD Instinct MI325X 256GB receives a C grade with 265.9 tok/s and 1.1M context.

What context window can Qwen3.5 27B use on AMD Instinct MI325X 256GB?

On AMD Instinct MI325X 256GB, Qwen3.5 27B can safely use up to 1.1M tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.