Can OpenChat 7B run on AMD Instinct MI250X 128GB?

YES — Runs Great

C47Usable

Estimated from fit model

OpenChat 7B needs ~19.9 GB VRAM. AMD Instinct MI250X 128GB has 128.0 GB. With Q4_K_M quantization, expect ~98 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) — 19.9 GB, 98.0 tok/s, Runs well

19.9 GB required128.0 GB available

16% VRAM used

Fit status

Runs well

Decode

98.0 tok/s

TTFT

1976 ms

Safe context

Memory

19.9 GB / 128.0 GB

Memory breakdown

Weights4.3 GB

KV Cache2.0 GB

Runtime0.9 GB

Headroom12.8 GB

See how fast it feels

See how fast it feelsOpenChat 7B 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: 98.0 tok/s decode · 2.0s TTFT (warm) · 245 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	98.0 tok/s	1078 ms	8K
Coding	C	Runs well	98.0 tok/s	1976 ms	8K
Agentic Coding	C	Runs well	98.0 tok/s	2873 ms	8K
Reasoning	C	Runs well	98.0 tok/s	2335 ms	8K
RAG	C	Runs well	98.0 tok/s	3592 ms	8K

Quantization options

How OpenChat 7B (7B params) fits at each quantization level on AMD Instinct MI250X 128GB (128.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	2.7 GB	Low	C40
Q3_K_S	3	3.4 GB	Low	C40
NVFP4	4

Get started

Copy-paste commands to run OpenChat 7B on your machine.

Run

ollama run openchat

Upgrade options

Hardware that runs OpenChat 7B well

Mac Studio M3 Ultra 256GBBudget pick

256 GB Unified (+128)

Adds memory headroom for longer context windows and future model growth.98 tok/s decode

Adds memory headroom for longer context windows and future model growth.

~$6,999 MSRP

Frequently asked questions

Can AMD Instinct MI250X 128GB run OpenChat 7B?

Yes, AMD Instinct MI250X 128GB can run OpenChat 7B with a C grade (Runs well). Expected decode speed: 98.0 tok/s.

How much VRAM does OpenChat 7B need?

OpenChat 7B (7B parameters) requires approximately 19.9 GB of memory with Q4_K_M quantization.

What is the best quantization for OpenChat 7B?

The recommended quantization for OpenChat 7B is Q4_K_M, which balances quality and memory efficiency.

What speed will OpenChat 7B run at on AMD Instinct MI250X 128GB?

On AMD Instinct MI250X 128GB, OpenChat 7B achieves approximately 98.0 tokens per second decode speed with a time-to-first-token of 1976ms using Q4_K_M quantization.

Can AMD Instinct MI250X 128GB run OpenChat 7B for coding?

For coding workloads, OpenChat 7B on AMD Instinct MI250X 128GB receives a C grade with 98.0 tok/s and 8K context.

What context window can OpenChat 7B use on AMD Instinct MI250X 128GB?

On AMD Instinct MI250X 128GB, OpenChat 7B can safely use up to 8K tokens of context. The model's official context limit is 8K, but available memory constrains the safe maximum.

See all results for AMD Instinct MI250X 128GB See all hardware for OpenChat 7B

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