Can Phi 4 Mini 4B run on GTX 1660 Super 6GB?

YES — With Offload

A73Great

Estimated from fit model

Phi 4 Mini 4B needs ~5.7 GB VRAM. GTX 1660 Super 6GB has 6.0 GB. With Q4_K_M quantization, expect ~56 tok/s.

Runtime: OllamaCapacity: OffloadBandwidth: 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) — 5.7 GB, 56.0 tok/s, Runs with offload

5.7 GB required6.0 GB available

95% VRAM used

Fit status

Runs with offload

Decode

56.0 tok/s

TTFT

3457 ms

Safe context

19K

Memory

5.7 GB / 6.0 GB

Memory breakdown

Weights2.4 GB

KV Cache1.5 GB

Runtime1.2 GB

Headroom0.6 GB

See how fast it feels

See how fast it feelsPhi 4 Mini 4B on GTX 1660 Super 6GB
1st promptCold start — includes initialization
>Solve: If a train travels at 60 mph for 2.5 hours, how far does it go?
Let me work through this step by step.

Given information:
  - Speed = 60 mph (miles per hour)
  - Time  = 2.5 hours

Formula: Distance = Speed x Time

Calculation:
  Distance = 60 mph x 2.5 h
           = 150 miles

The train travels 150 miles.

Double-check: at 60 mph the train covers 60 miles each hour. In half an hour it covers 30 miles. So in 2.5 hours: 60 + 60 + 30 = 150 miles. Confirmed.
2nd promptWarm — model ready, no init overhead
>What if the train stops for 20 minutes halfway?
The stop doesn't change the total distance covered while moving, but it affects total trip time.

Breakdown:
  - First half: 1.25 hours at 60 mph = 75 miles
  - Stop: 20 minutes (no distance)
  - Second half: 1.25 hours at 60 mph = 75 miles

Total distance: 150 miles (same)
Total time: 2.5 h + 0.33 h = 2.83 hours
Average speed: 150 / 2.83 = 53 mph

The distance stays the same but average speed drops to 53 mph because of the stop.
Estimated: 56.0 tok/s decode · 3.5s TTFT (warm) · 140 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.

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

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	A	Tight fit	56.0 tok/s	1886 ms	19K
Coding	A	Runs with offload	56.0 tok/s	3457 ms	19K
Agentic Coding	B	Very compromised (needs ~0.4 GB host RAM)	40.2 tok/s	7011 ms	19K
Reasoning	A	Runs with offload	56.0 tok/s	4086 ms	19K
RAG	B	Very compromised (needs ~0.4 GB host RAM)	40.2 tok/s	8764 ms	19K

Quantization options

How Phi 4 Mini 4B (4B params) fits at each quantization level on GTX 1660 Super 6GB (6.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	1.6 GB	Low	A75
Q3_K_S	3	2.0 GB	Low	A75
NVFP4	4	2.2 GB	Medium	A75
Q4_K_M	4	2.4 GB	Medium	A75
Q5_K_M	5	2.9 GB	High	A75
Q6_KBest for your GPU	6	3.3 GB	High	A74
Q8_0	8	4.3 GB	Very High	F0
F16	16	8.2 GB	Maximum	F0

Get started

Copy-paste commands to run Phi 4 Mini 4B on your machine.

Run

ollama run phi4-mini

Your hardware

More models your GTX 1660 Super 6GB can run

Model	Params	Grade	Decode
Qwen 2.5 VL 7B	7B	B	25 tok/s
Qwen 2.5 7B	7B	B	25 tok/s
Codestral Mamba 7B	7B	B	26 tok/s
Gemma 4 E2B	5.1B	A	64.6 tok/s

Frequently asked questions

Can GTX 1660 Super 6GB run Phi 4 Mini 4B?

Yes, GTX 1660 Super 6GB can run Phi 4 Mini 4B with a A grade (Runs with offload). Expected decode speed: 56.0 tok/s.

How much VRAM does Phi 4 Mini 4B need?

Phi 4 Mini 4B (4B parameters) requires approximately 5.7 GB of memory with Q4_K_M quantization.

What is the best quantization for Phi 4 Mini 4B?

The recommended quantization for Phi 4 Mini 4B is Q4_K_M, which balances quality and memory efficiency.

What speed will Phi 4 Mini 4B run at on GTX 1660 Super 6GB?

On GTX 1660 Super 6GB, Phi 4 Mini 4B achieves approximately 56.0 tokens per second decode speed with a time-to-first-token of 3457ms using Q4_K_M quantization.

Can GTX 1660 Super 6GB run Phi 4 Mini 4B for coding?

For coding workloads, Phi 4 Mini 4B on GTX 1660 Super 6GB receives a A grade with 56.0 tok/s and 19K context.

What context window can Phi 4 Mini 4B use on GTX 1660 Super 6GB?

On GTX 1660 Super 6GB, Phi 4 Mini 4B can safely use up to 19K tokens of context. The model's official context limit is 128K, but available memory constrains the safe maximum.

What should I upgrade first if Phi 4 Mini 4B feels slow on GTX 1660 Super 6GB?

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 GTX 1660 Super 6GB See all hardware for Phi 4 Mini 4B

Embed this result▼

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

<iframe src="https://willitrunai.com/embed/phi-4-mini-4b-on-gtx-1660-super-6gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>

Preview: