Can Qwen2.5 1.5B Instruct run on GTX 1080 8GB?

YES — Runs Great

C46Usable

Estimated from fit model

Qwen2.5 1.5B Instruct needs ~3.1 GB VRAM. GTX 1080 8GB has 8.0 GB. With Q4_K_M quantization, expect ~21 tok/s.

Runtime: OllamaCapacity: RoomyBandwidth: LowStack: 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) — 3.1 GB, 21.0 tok/s, Runs well

3.1 GB required8.0 GB available

39% VRAM used

Fit status

Runs well

Decode

21.0 tok/s

TTFT

9219 ms

Safe context

463K

Memory

3.1 GB / 8.0 GB

Memory breakdown

Weights0.9 GB

KV Cache0.2 GB

Runtime1.2 GB

Headroom0.8 GB

See how fast it feels

See how fast it feelsQwen2.5 1.5B Instruct on GTX 1080 8GB
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: 21.0 tok/s decode · 9.2s TTFT (warm) · 53 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

Older PCIe generation

PCIe 3.0 is workable, but it compounds the penalty when you offload heavily or try to scale across multiple cards.

Best improvement path

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	C	Runs well	21.0 tok/s	5029 ms	407K
Coding	C	Runs well	21.0 tok/s	9219 ms	463K
Agentic Coding	C	Runs well	21.0 tok/s	13410 ms	463K
Reasoning	C	Runs well	21.0 tok/s	10895 ms	463K
RAG	C	Runs well	21.0 tok/s	16762 ms	463K

Quantization options

How Qwen2.5 1.5B Instruct (1.5B params) fits at each quantization level on GTX 1080 8GB (8.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	0.6 GB	Low	C49
Q3_K_S	3	0.7 GB	Low	C50
NVFP4	4	0.8 GB	Medium	C50
Q4_K_M	4	0.9 GB	Medium	C50
Q5_K_M	5	1.1 GB	High	C50
Q6_K	6	1.2 GB	High	C51
Q8_0	8	1.6 GB	Very High	C51
F16Best for your GPU	16	3.1 GB	Maximum	C54

Get started

Copy-paste commands to run Qwen2.5 1.5B Instruct on your machine.

Run

lms load hf-qwen--qwen2-5-1-5b-instruct-gguf && lms server start

Frequently asked questions

Can GTX 1080 8GB run Qwen2.5 1.5B Instruct?

Yes, GTX 1080 8GB can run Qwen2.5 1.5B Instruct with a C grade (Runs well). Expected decode speed: 21.0 tok/s.

How much VRAM does Qwen2.5 1.5B Instruct need?

Qwen2.5 1.5B Instruct (1.5B parameters) requires approximately 3.1 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen2.5 1.5B Instruct?

The recommended quantization for Qwen2.5 1.5B Instruct is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen2.5 1.5B Instruct run at on GTX 1080 8GB?

On GTX 1080 8GB, Qwen2.5 1.5B Instruct achieves approximately 21.0 tokens per second decode speed with a time-to-first-token of 9219ms using Q4_K_M quantization.

Can GTX 1080 8GB run Qwen2.5 1.5B Instruct for coding?

For coding workloads, Qwen2.5 1.5B Instruct on GTX 1080 8GB receives a C grade with 21.0 tok/s and 463K context.

What context window can Qwen2.5 1.5B Instruct use on GTX 1080 8GB?

On GTX 1080 8GB, Qwen2.5 1.5B Instruct can safely use up to 463K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

See all results for GTX 1080 8GB See all hardware for Qwen2.5 1.5B Instruct

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