Can Llama 2 7B Chat run on RTX 4000 Ada 20GB?

YES — Runs Great

C50Usable

Estimated from fit model

Llama 2 7B Chat needs ~8.3 GB VRAM. RTX 4000 Ada 20GB has 20.0 GB. With Q4_K_M quantization, expect ~66 tok/s.

Runtime: OllamaCapacity: RoomyBandwidth: LowStack: 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) — 8.3 GB, 65.8 tok/s, Runs well

8.3 GB required20.0 GB available

42% VRAM used

Fit status

Runs well

Decode

65.8 tok/s

TTFT

2944 ms

Safe context

244K

Memory

8.3 GB / 20.0 GB

Memory breakdown

Weights4.3 GB

KV Cache0.8 GB

Runtime1.2 GB

Headroom2.0 GB

See how fast it feels

See how fast it feelsLlama 2 7B Chat on RTX 4000 Ada 20GB
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: 65.8 tok/s decode · 2.9s TTFT (warm) · 164 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	65.8 tok/s	1606 ms	244K
Coding	C	Runs well	65.8 tok/s	2944 ms	244K
Agentic Coding	C	Runs well	65.8 tok/s	4282 ms	244K
Reasoning	C	Runs well	65.8 tok/s	3479 ms	244K
RAG	C	Runs well	65.8 tok/s	5353 ms	244K

Quantization options

How Llama 2 7B Chat (7B params) fits at each quantization level on RTX 4000 Ada 20GB (20.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	2.7 GB	Low	C46
Q3_K_S	3	3.4 GB	Low	C46
NVFP4	4

Get started

Copy-paste commands to run Llama 2 7B Chat on your machine.

Run

lms load hf-thebloke--llama-2-7b-chat-gguf && lms server start

Frequently asked questions

Can RTX 4000 Ada 20GB run Llama 2 7B Chat?

Yes, RTX 4000 Ada 20GB can run Llama 2 7B Chat with a C grade (Runs well). Expected decode speed: 65.8 tok/s.

How much VRAM does Llama 2 7B Chat need?

Llama 2 7B Chat (7B parameters) requires approximately 8.3 GB of memory with Q4_K_M quantization.

What is the best quantization for Llama 2 7B Chat?

The recommended quantization for Llama 2 7B Chat is Q4_K_M, which balances quality and memory efficiency.

What speed will Llama 2 7B Chat run at on RTX 4000 Ada 20GB?

On RTX 4000 Ada 20GB, Llama 2 7B Chat achieves approximately 65.8 tokens per second decode speed with a time-to-first-token of 2944ms using Q4_K_M quantization.

Can RTX 4000 Ada 20GB run Llama 2 7B Chat for coding?

For coding workloads, Llama 2 7B Chat on RTX 4000 Ada 20GB receives a C grade with 65.8 tok/s and 244K context.

What context window can Llama 2 7B Chat use on RTX 4000 Ada 20GB?

On RTX 4000 Ada 20GB, Llama 2 7B Chat can safely use up to 244K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

See all results for RTX 4000 Ada 20GB See all hardware for Llama 2 7B Chat

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