Can Phi 4 reasoning vision 15B run on RTX A4500 20GB?

YES — Runs Great

B55Good

Estimated from fit model

Phi 4 reasoning vision 15B needs ~14.1 GB VRAM. RTX A4500 20GB has 20.0 GB. With Q4_K_M quantization, expect ~55 tok/s.

Runtime: OllamaCapacity: RoomyBandwidth: MediumStack: 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) — 14.1 GB, 54.6 tok/s, Runs well

14.1 GB required20.0 GB available

71% VRAM used

Fit status

Runs well

Decode

54.6 tok/s

TTFT

3549 ms

Safe context

70K

Memory

14.1 GB / 20.0 GB

Memory breakdown

Weights9.2 GB

KV Cache1.8 GB

Runtime1.2 GB

Headroom2.0 GB

See how fast it feels

See how fast it feelsPhi 4 reasoning vision 15B on RTX A4500 20GB
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: 54.6 tok/s decode · 3.5s TTFT (warm) · 136 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	C	Runs well	54.6 tok/s	1936 ms	70K
Coding	B	Runs well	54.6 tok/s	3549 ms	70K
Agentic Coding	B	Runs well	54.6 tok/s	5162 ms	70K
Reasoning	B	Runs well	54.6 tok/s	4194 ms	70K
RAG	B	Runs well	54.6 tok/s	6452 ms	70K

Quantization options

How Phi 4 reasoning vision 15B (15B params) fits at each quantization level on RTX A4500 20GB (20.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	5.9 GB	Low	C47
Q3_K_S	3	7.4 GB	Low	C49
NVFP4	4	8.4 GB	Medium	C49
Q4_K_M	4	9.2 GB	Medium	C50
Q5_K_M	5	10.8 GB	High	C51
Q6_K	6	12.3 GB	High	C50
Q8_0Best for your GPU	8	16.1 GB	Very High	C50
F16	16	30.7 GB	Maximum	F0

Get started

Copy-paste commands to run Phi 4 reasoning vision 15B on your machine.

Run

lms load hf-jamesburton--phi-4-reasoning-vision-15b-gguf && lms server start

Frequently asked questions

Can RTX A4500 20GB run Phi 4 reasoning vision 15B?

Yes, RTX A4500 20GB can run Phi 4 reasoning vision 15B with a B grade (Runs well). Expected decode speed: 54.6 tok/s.

How much VRAM does Phi 4 reasoning vision 15B need?

Phi 4 reasoning vision 15B (15B parameters) requires approximately 14.1 GB of memory with Q4_K_M quantization.

What is the best quantization for Phi 4 reasoning vision 15B?

The recommended quantization for Phi 4 reasoning vision 15B is Q4_K_M, which balances quality and memory efficiency.

What speed will Phi 4 reasoning vision 15B run at on RTX A4500 20GB?

On RTX A4500 20GB, Phi 4 reasoning vision 15B achieves approximately 54.6 tokens per second decode speed with a time-to-first-token of 3549ms using Q4_K_M quantization.

Can RTX A4500 20GB run Phi 4 reasoning vision 15B for coding?

For coding workloads, Phi 4 reasoning vision 15B on RTX A4500 20GB receives a B grade with 54.6 tok/s and 70K context.

What context window can Phi 4 reasoning vision 15B use on RTX A4500 20GB?

On RTX A4500 20GB, Phi 4 reasoning vision 15B can safely use up to 70K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

See all results for RTX A4500 20GB See all hardware for Phi 4 reasoning vision 15B

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