Can internlm2 5 20b chat run on RTX 4090 24GB?

YES — Runs Great

B55Good

Estimated from fit model

internlm2 5 20b chat needs ~18.1 GB VRAM. RTX 4090 24GB has 24.0 GB. With Q4_K_M quantization, expect ~63 tok/s.

Runtime: OllamaCapacity: RoomyBandwidth: HighStack: 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) — 18.1 GB, 62.8 tok/s, Runs well

18.1 GB required24.0 GB available

75% VRAM used

Fit status

Runs well

Decode

62.8 tok/s

TTFT

3083 ms

Safe context

56K

Memory

18.1 GB / 24.0 GB

Memory breakdown

Weights12.2 GB

KV Cache2.3 GB

Runtime1.2 GB

Headroom2.4 GB

See how fast it feels

See how fast it feelsinternlm2 5 20b chat on RTX 4090 24GB
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: 62.8 tok/s decode · 3.1s TTFT (warm) · 157 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	B	Runs well	62.8 tok/s	1682 ms	56K
Coding	B	Runs well	62.8 tok/s	3083 ms	56K
Agentic Coding	C	Tight fit	62.8 tok/s	4485 ms	56K
Reasoning	B	Runs well	62.8 tok/s	3644 ms	56K
RAG	C	Tight fit	62.8 tok/s	5606 ms	56K

Quantization options

How internlm2 5 20b chat (20B params) fits at each quantization level on RTX 4090 24GB (24.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	7.8 GB	Low	C47
Q3_K_S	3	9.8 GB	Low	C48
NVFP4	4	11.2 GB	Medium	C49
Q4_K_M	4	12.2 GB	Medium	C50
Q5_K_M	5	14.4 GB	High	C50
Q6_KBest for your GPU	6	16.4 GB	High	C49
Q8_0	8	21.4 GB	Very High	F0
F16	16	41.0 GB	Maximum	F0

Get started

Copy-paste commands to run internlm2 5 20b chat on your machine.

Run

lms load hf-bartowski--internlm2-5-20b-chat-gguf && lms server start

Frequently asked questions

Can RTX 4090 24GB run internlm2 5 20b chat?

Yes, RTX 4090 24GB can run internlm2 5 20b chat with a B grade (Runs well). Expected decode speed: 62.8 tok/s.

How much VRAM does internlm2 5 20b chat need?

internlm2 5 20b chat (20B parameters) requires approximately 18.1 GB of memory with Q4_K_M quantization.

What is the best quantization for internlm2 5 20b chat?

The recommended quantization for internlm2 5 20b chat is Q4_K_M, which balances quality and memory efficiency.

What speed will internlm2 5 20b chat run at on RTX 4090 24GB?

On RTX 4090 24GB, internlm2 5 20b chat achieves approximately 62.8 tokens per second decode speed with a time-to-first-token of 3083ms using Q4_K_M quantization.

Can RTX 4090 24GB run internlm2 5 20b chat for coding?

For coding workloads, internlm2 5 20b chat on RTX 4090 24GB receives a B grade with 62.8 tok/s and 56K context.

What context window can internlm2 5 20b chat use on RTX 4090 24GB?

On RTX 4090 24GB, internlm2 5 20b chat can safely use up to 56K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

See all results for RTX 4090 24GB See all hardware for internlm2 5 20b chat

Embed this result▼

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<iframe src="https://willitrunai.com/embed/hf-bartowski--internlm2-5-20b-chat-gguf-on-rtx-4090-24gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>

Preview:

Workload

Grade

Fit

Decode

TTFT

Context

Chat

Runs well

62.8 tok/s

1682 ms

56K

Coding

Runs well

62.8 tok/s

3083 ms

56K

Agentic Coding

Tight fit

62.8 tok/s

4485 ms

56K

Reasoning

Runs well

62.8 tok/s

3644 ms

56K

RAG

Tight fit

62.8 tok/s

5606 ms

56K

Quantization options

How internlm2 5 20b chat (20B params) fits at each quantization level on RTX 4090 24GB (24.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	7.8 GB	Low	C47
Q3_K_S	3	9.8 GB	Low	C48
NVFP4	4	11.2 GB	Medium	C49
Q4_K_M	4	12.2 GB	Medium	C50
Q5_K_M	5	14.4 GB	High	C50
Q6_KBest for your GPU	6	16.4 GB	High	C49
Q8_0	8	21.4 GB	Very High	F0
F16	16	41.0 GB	Maximum	F0

Frequently asked questions

Can RTX 4090 24GB run internlm2 5 20b chat?

Yes, RTX 4090 24GB can run internlm2 5 20b chat with a B grade (Runs well). Expected decode speed: 62.8 tok/s.

How much VRAM does internlm2 5 20b chat need?

internlm2 5 20b chat (20B parameters) requires approximately 18.1 GB of memory with Q4_K_M quantization.

What is the best quantization for internlm2 5 20b chat?

The recommended quantization for internlm2 5 20b chat is Q4_K_M, which balances quality and memory efficiency.

What speed will internlm2 5 20b chat run at on RTX 4090 24GB?

On RTX 4090 24GB, internlm2 5 20b chat achieves approximately 62.8 tokens per second decode speed with a time-to-first-token of 3083ms using Q4_K_M quantization.

Can RTX 4090 24GB run internlm2 5 20b chat for coding?

For coding workloads, internlm2 5 20b chat on RTX 4090 24GB receives a B grade with 62.8 tok/s and 56K context.

What context window can internlm2 5 20b chat use on RTX 4090 24GB?

On RTX 4090 24GB, internlm2 5 20b chat can safely use up to 56K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.