Can OpenChat 7B run on RX 7800 XT 16GB?

YES — Runs Great

B56Good

Estimated from fit model

OpenChat 7B needs ~8.7 GB VRAM. RX 7800 XT 16GB has 16.0 GB. With Q4_K_M quantization, expect ~97 tok/s.

Runtime: llama.cppCapacity: RoomyBandwidth: MediumStack: 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) — 8.7 GB, 97.4 tok/s, Runs well

8.7 GB required16.0 GB available

54% VRAM used

Fit status

Runs well

Decode

97.4 tok/s

TTFT

1988 ms

Safe context

Memory

8.7 GB / 16.0 GB

Memory breakdown

Weights4.3 GB

KV Cache2.0 GB

Runtime0.9 GB

Headroom1.6 GB

See how fast it feels

See how fast it feelsOpenChat 7B on RX 7800 XT 16GB
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: 97.4 tok/s decode · 2.0s TTFT (warm) · 244 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	97.4 tok/s	1084 ms	8K
Coding	B	Runs well	97.4 tok/s	1988 ms	8K
Agentic Coding	B	Runs well	97.4 tok/s	2891 ms	8K
Reasoning	B	Runs well	97.4 tok/s	2349 ms	8K
RAG	B	Runs well	97.4 tok/s	3614 ms	8K

Quantization options

How OpenChat 7B (7B params) fits at each quantization level on RX 7800 XT 16GB (16.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	2.7 GB	Low	C49
Q3_K_S	3	3.4 GB	Low	C49
NVFP4	4

Get started

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

Run

ollama run openchat

Frequently asked questions

Can RX 7800 XT 16GB run OpenChat 7B?

Yes, RX 7800 XT 16GB can run OpenChat 7B with a B grade (Runs well). Expected decode speed: 97.4 tok/s.

How much VRAM does OpenChat 7B need?

OpenChat 7B (7B parameters) requires approximately 8.7 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 RX 7800 XT 16GB?

On RX 7800 XT 16GB, OpenChat 7B achieves approximately 97.4 tokens per second decode speed with a time-to-first-token of 1988ms using Q4_K_M quantization.

Can RX 7800 XT 16GB run OpenChat 7B for coding?

For coding workloads, OpenChat 7B on RX 7800 XT 16GB receives a B grade with 97.4 tok/s and 8K context.

What context window can OpenChat 7B use on RX 7800 XT 16GB?

On RX 7800 XT 16GB, 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 RX 7800 XT 16GB See all hardware for OpenChat 7B

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