Can internlm2 5 20b chat run on AMD Instinct MI250X 128GB?

YES — Runs Great

C46Usable

Estimated from fit model

internlm2 5 20b chat needs ~28.2 GB VRAM. AMD Instinct MI250X 128GB has 128.0 GB. With Q4_K_M quantization, expect ~205 tok/s.

Runtime: llama.cppCapacity: RoomyBandwidth: HighStack: StandardBottleneck: 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) — 28.2 GB, 204.6 tok/s, Runs well

28.2 GB required128.0 GB available

22% VRAM used

Fit status

Runs well

Decode

204.6 tok/s

TTFT

946 ms

Safe context

697K

Memory

28.2 GB / 128.0 GB

Memory breakdown

Weights12.2 GB

KV Cache2.3 GB

Runtime0.9 GB

Headroom12.8 GB

See how fast it feels

See how fast it feelsinternlm2 5 20b chat on AMD Instinct MI250X 128GB
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: 204.6 tok/s decode · 946ms TTFT (warm) · 512 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	204.6 tok/s	516 ms	697K
Coding	C	Runs well	204.6 tok/s	946 ms	697K
Agentic Coding	C	Runs well	204.6 tok/s	1376 ms	697K
Reasoning	C	Runs well	204.6 tok/s	1118 ms	697K
RAG	C	Runs well	204.6 tok/s	1721 ms	697K

Quantization options

How internlm2 5 20b chat (20B params) fits at each quantization level on AMD Instinct MI250X 128GB (128.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	7.8 GB	Low	D38
Q3_K_S	3	9.8 GB	Low	D38
NVFP4	4

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 AMD Instinct MI250X 128GB run internlm2 5 20b chat?

Yes, AMD Instinct MI250X 128GB can run internlm2 5 20b chat with a C grade (Runs well). Expected decode speed: 204.6 tok/s.

How much VRAM does internlm2 5 20b chat need?

internlm2 5 20b chat (20B parameters) requires approximately 28.2 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 AMD Instinct MI250X 128GB?

On AMD Instinct MI250X 128GB, internlm2 5 20b chat achieves approximately 204.6 tokens per second decode speed with a time-to-first-token of 946ms using Q4_K_M quantization.

Can AMD Instinct MI250X 128GB run internlm2 5 20b chat for coding?

For coding workloads, internlm2 5 20b chat on AMD Instinct MI250X 128GB receives a C grade with 204.6 tok/s and 697K context.

What context window can internlm2 5 20b chat use on AMD Instinct MI250X 128GB?

On AMD Instinct MI250X 128GB, internlm2 5 20b chat can safely use up to 697K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

See all results for AMD Instinct MI250X 128GB See all hardware for internlm2 5 20b chat

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