Can Qwen 3.5 27B run on NVIDIA H800 80GB?

YES — Runs Great

S92Excellent

Estimated from fit model

Qwen 3.5 27B needs ~28.8 GB VRAM. NVIDIA H800 80GB has 80.0 GB. With Q4_K_M quantization, expect ~159 tok/s.

Runtime: OllamaCapacity: RoomyBandwidth: HighStack: BasicBottleneck: 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) — 28.8 GB, 159.3 tok/s, Runs well

28.8 GB required80.0 GB available

36% VRAM used

Fit status

Runs well

Decode

159.3 tok/s

TTFT

1215 ms

Safe context

131K

Memory

28.8 GB / 80.0 GB

Memory breakdown

Weights16.5 GB

KV Cache3.2 GB

Runtime1.2 GB

Headroom8.0 GB

See how fast it feels

See how fast it feelsQwen 3.5 27B on NVIDIA H800 80GB
1st promptCold start — includes initialization
>Write a Python function to sort a list
Here's a Python function that sorts a list using quicksort:

def quicksort(arr):
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left   = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right  = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

# Example usage
numbers = [3, 6, 8, 10, 1, 2, 1]
print(quicksort(numbers))  # [1, 1, 2, 3, 6, 8, 10]

The algorithm picks a pivot, partitions the list into smaller, equal, and larger elements, then recursively sorts each partition and concatenates the results.
2nd promptWarm — model ready, no init overhead
>Now add type hints and a docstring
def quicksort(arr: list[int]) -> list[int]:
    """Sort a list using the quicksort algorithm.

    Args:
        arr: List of integers to sort.

    Returns:
        A new sorted list.
    """
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left   = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right  = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

Added type hints for the input and return type, plus a Google-style docstring.
Estimated: 159.3 tok/s decode · 1.2s TTFT (warm) · 398 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	S	Runs well	159.3 tok/s	663 ms	131K
Coding	S	Runs well	159.3 tok/s	1215 ms	131K
Agentic Coding	S	Runs well	159.3 tok/s	1767 ms	131K
Reasoning	S	Runs well	159.3 tok/s	1436 ms	131K
RAG	S	Runs well	159.3 tok/s	2209 ms	131K

Quantization options

How Qwen 3.5 27B (27B params) fits at each quantization level on NVIDIA H800 80GB (80.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	10.5 GB	Low	A83
Q3_K_S	3	13.2 GB	Low	A83
NVFP4	4

Get started

Copy-paste commands to run Qwen 3.5 27B on your machine.

Run

ollama run qwen3.5:27b

Your hardware

More models your NVIDIA H800 80GB can run

Model	Params	Grade	Decode	Capabilities
Devstral 2 123B Instruct	123B	A	24.9 tok/s
Qwen3-Coder 30B A3B Instruct	30.5B	S

Frequently asked questions

Can NVIDIA H800 80GB run Qwen 3.5 27B?

Yes, NVIDIA H800 80GB can run Qwen 3.5 27B with a S grade (Runs well). Expected decode speed: 159.3 tok/s.

How much VRAM does Qwen 3.5 27B need?

Qwen 3.5 27B (27B parameters) requires approximately 28.8 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen 3.5 27B?

The recommended quantization for Qwen 3.5 27B is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen 3.5 27B run at on NVIDIA H800 80GB?

On NVIDIA H800 80GB, Qwen 3.5 27B achieves approximately 159.3 tokens per second decode speed with a time-to-first-token of 1215ms using Q4_K_M quantization.

Can NVIDIA H800 80GB run Qwen 3.5 27B for coding?

For coding workloads, Qwen 3.5 27B on NVIDIA H800 80GB receives a S grade with 159.3 tok/s and 131K context.

What context window can Qwen 3.5 27B use on NVIDIA H800 80GB?

On NVIDIA H800 80GB, Qwen 3.5 27B can safely use up to 131K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.

See all results for NVIDIA H800 80GB See all hardware for Qwen 3.5 27B

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