Can Qwen 3.5 27B run on RTX 3090 24GB?

YES — With Offload

S93Excellent

Measured on real hardware· rtx-3090-24gb

Qwen 3.5 27B needs ~22.9 GB VRAM. RTX 3090 24GB has 24.0 GB. With Q4_K_M quantization, expect ~30 tok/s.

Runtime: llama.cppCapacity: OffloadBandwidth: 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) — 22.9 GB, 29.3 tok/s, Runs with offload

22.9 GB required24.0 GB available

95% VRAM used

Fit status

Runs with offload

Decode

29.3 tok/s

TTFT

6609 ms

Safe context

21K

Memory

22.9 GB / 24.0 GB

Memory breakdown

Weights16.5 GB

KV Cache3.2 GB

Runtime0.9 GB

Headroom2.4 GB

See how fast it feels

See how fast it feelsQwen 3.5 27B on RTX 3090 24GB
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: 29.3 tok/s decode · 6.6s TTFT (warm) · 73 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

Very little memory headroom

You can run the model, but there is not much room left for longer context, bigger batches, extra apps, or future model updates.

Best improvement path

Buy headroom, not only minimum fit

A slightly larger memory tier gives you safer context growth and makes the recommendation more future-proof.

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	S	Tight fit	29.3 tok/s	3605 ms	21K
Coding	S	Runs with offload	30.0 tok/s	4867 ms	21K
Agentic Coding	A	Very compromised (needs ~1.3 GB host RAM)	18.4 tok/s	15313 ms	21K
Reasoning	S	Runs with offload	29.3 tok/s	7810 ms	21K
RAG	A	Very compromised (needs ~1.3 GB host RAM)	18.4 tok/s	19142 ms	21K

Quantization options

How Qwen 3.5 27B (27B params) fits at each quantization level on RTX 3090 24GB (24.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	10.5 GB	Low	S92
Q3_K_S	3	13.2 GB	Low	S93
NVFP4	4	15.1 GB	Medium	S92
Q4_K_MBest for your GPU	4	16.5 GB	Medium	S92
Q5_K_M	5	19.4 GB	High	F0
Q6_K	6	22.1 GB	High	F0
Q8_0	8	28.9 GB	Very High	F0
F16	16	55.4 GB	Maximum	F0

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 RTX 3090 24GB can run

Model	Params	Grade	Decode	Capabilities
Qwen3-Coder 30B A3B Instruct	30.5B	S	65.4 tok/s

Frequently asked questions

Can RTX 3090 24GB run Qwen 3.5 27B?

Yes, RTX 3090 24GB can run Qwen 3.5 27B with a S grade (Runs with offload). Expected decode speed: 30.0 tok/s.

How much VRAM does Qwen 3.5 27B need?

Qwen 3.5 27B (27B parameters) requires approximately 22.9 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 RTX 3090 24GB?

On RTX 3090 24GB, Qwen 3.5 27B achieves approximately 30.0 tokens per second decode speed with a time-to-first-token of 4867ms using Q4_K_M quantization.

Can RTX 3090 24GB run Qwen 3.5 27B for coding?

For coding workloads, Qwen 3.5 27B on RTX 3090 24GB receives a S grade with 30.0 tok/s and 21K context.

What context window can Qwen 3.5 27B use on RTX 3090 24GB?

On RTX 3090 24GB, Qwen 3.5 27B can safely use up to 21K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.

What should I upgrade first if Qwen 3.5 27B feels slow on RTX 3090 24GB?

Buy headroom, not only minimum fit. A slightly larger memory tier gives you safer context growth and makes the recommendation more future-proof.

See all results for RTX 3090 24GB See all hardware for Qwen 3.5 27B

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