Can Qwen 2.5 1.5B run on GTX 1660 Ti 6GB?

YES — Runs Great

B56Good

Estimated from fit model

Qwen 2.5 1.5B needs ~3.1 GB VRAM. GTX 1660 Ti 6GB has 6.0 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 required6.0 GB available

52% VRAM used

Fit status

Runs well

Decode

21.0 tok/s

TTFT

9219 ms

Safe context

123K

Memory

3.1 GB / 6.0 GB

Memory breakdown

Weights0.9 GB

KV Cache0.4 GB

Runtime1.2 GB

Headroom0.6 GB

See how fast it feels

See how fast it feelsQwen 2.5 1.5B on GTX 1660 Ti 6GB
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	B	Runs well	21.0 tok/s	5029 ms	123K
Coding	B	Runs well	21.0 tok/s	9219 ms	123K
Agentic Coding	B	Runs well	21.0 tok/s	13410 ms	123K
Reasoning	B	Runs well	21.0 tok/s	10895 ms	123K
RAG	B	Runs well	21.0 tok/s	16762 ms	123K

Quantization options

How Qwen 2.5 1.5B (1.5B params) fits at each quantization level on GTX 1660 Ti 6GB (6.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	0.6 GB	Low	B60
Q3_K_S	3	0.7 GB	Low	B60
NVFP4	4

Get started

Copy-paste commands to run Qwen 2.5 1.5B on your machine.

Run

ollama run qwen2.5:1.5b

Frequently asked questions

Can GTX 1660 Ti 6GB run Qwen 2.5 1.5B?

Yes, GTX 1660 Ti 6GB can run Qwen 2.5 1.5B with a B grade (Runs well). Expected decode speed: 21.0 tok/s.

How much VRAM does Qwen 2.5 1.5B need?

Qwen 2.5 1.5B (1.5B parameters) requires approximately 3.1 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen 2.5 1.5B?

The recommended quantization for Qwen 2.5 1.5B is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen 2.5 1.5B run at on GTX 1660 Ti 6GB?

On GTX 1660 Ti 6GB, Qwen 2.5 1.5B achieves approximately 21.0 tokens per second decode speed with a time-to-first-token of 9219ms using Q4_K_M quantization.

Can GTX 1660 Ti 6GB run Qwen 2.5 1.5B for coding?

For coding workloads, Qwen 2.5 1.5B on GTX 1660 Ti 6GB receives a B grade with 21.0 tok/s and 123K context.

What context window can Qwen 2.5 1.5B use on GTX 1660 Ti 6GB?

On GTX 1660 Ti 6GB, Qwen 2.5 1.5B can safely use up to 123K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.

See all results for GTX 1660 Ti 6GB See all hardware for Qwen 2.5 1.5B

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