Can zephyr 7B alpha run on RTX 4070 12GB?

YES — Runs Great

B55Good

Estimated from fit model

zephyr 7B alpha needs ~7.5 GB VRAM. RTX 4070 12GB has 12.0 GB. With Q4_K_M quantization, expect ~89 tok/s.

Runtime: OllamaCapacity: RoomyBandwidth: MediumStack: 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) — 7.5 GB, 88.5 tok/s, Runs well

7.5 GB required12.0 GB available

63% VRAM used

Fit status

Runs well

Decode

88.5 tok/s

TTFT

2187 ms

Safe context

104K

Memory

7.5 GB / 12.0 GB

Memory breakdown

Weights4.3 GB

KV Cache0.8 GB

Runtime1.2 GB

Headroom1.2 GB

See how fast it feels

See how fast it feelszephyr 7B alpha on RTX 4070 12GB
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: 88.5 tok/s decode · 2.2s TTFT (warm) · 221 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	88.5 tok/s	1193 ms	104K
Coding	B	Runs well	88.5 tok/s	2187 ms	104K
Agentic Coding	B	Runs well	88.5 tok/s	3181 ms	104K
Reasoning	B	Runs well	88.5 tok/s	2585 ms	104K
RAG	B	Runs well	88.5 tok/s	3976 ms	104K

Inference speed

zephyr 7B alpha inference speed — tokens per second by GPU & Mac

Estimated decode speed (tokens/sec) for zephyr 7B alpha at Q4_K_M across popular GPUs and Apple Silicon, using the fastest local runtime per device. Fastest is RTX 5090 32GB at ~98 tok/s. Speed is memory-bandwidth bound, so cards that fit the whole model in VRAM run far faster than ones that offload to system RAM.

GPU / Mac	Memory	Quant	Speed (tok/s)	Fits?
RTX 5090 32GB	32 GB	Q4_K_M	98.0	Fits
RTX 4090 24GB	24 GB	Q4_K_M	98.0	Fits
RTX 4080 Super 16GB	16 GB	Q4_K_M	98.0	Fits
RTX 3090 24GB	24 GB	Q4_K_M	98.0	Fits
RX 7900 XTX 24GB	24 GB	Q4_K_M	98.0	Fits
Mac Studio M3 Ultra 256GB	256 GB	Q4_K_M	98.0	Fits
Mac Studio M2 Ultra 128GB	128 GB	Q4_K_M	98.0	Fits
Mac Studio M1 Ultra 128GB	128 GB	Q4_K_M	98.0	Fits
RTX 4070 12GB	12 GB	Q4_K_M	88.5	Fits
MacBook Pro M4 Max 128GB	128 GB	Q4_K_M	87.8	Fits
MacBook Pro M4 Max 64GB	64 GB	Q4_K_M	87.8	Fits
MacBook Pro M3 Max 64GB	64 GB	Q4_K_M	56.2	Fits
RTX 3060 12GB	12 GB	Q4_K_M	55.6	Fits
MacBook Pro M1 Max 64GB	64 GB	Q4_K_M	51.5	Fits
RTX 4060 8GB	8 GB	Q4_K_M	46.5	Tight
MacBook Pro M4 Pro 48GB	48 GB	Q4_K_M	45.3	Fits

Estimates for single-stream decoding at Q4_K_M; real tokens/sec varies with prompt length, context, batch size, and runtime build. Prompt processing (prefill) is faster than the decode figures shown here.

Quantization options

How zephyr 7B alpha (7B params) fits at each quantization level on RTX 4070 12GB (12.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	2.7 GB	Low	C49
Q3_K_S	3	3.4 GB	Low	C50
NVFP4	4	3.9 GB	Medium	C50
Q4_K_M	4	4.3 GB	Medium	C51
Q5_K_M	5	5.0 GB	High	C52
Q6_K	6	5.7 GB	High	C52
Q8_0Best for your GPU	8	7.5 GB	Very High	C52
F16	16	14.3 GB	Maximum	F0

Get started

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

Run

lms load hf-thebloke--zephyr-7b-alpha-gguf && lms server start

Frequently asked questions

Can RTX 4070 12GB run zephyr 7B alpha?

Yes, RTX 4070 12GB can run zephyr 7B alpha with a B grade (Runs well). Expected decode speed: 88.5 tok/s.

How much VRAM does zephyr 7B alpha need?

zephyr 7B alpha (7B parameters) requires approximately 7.5 GB of memory with Q4_K_M quantization.

What is the best quantization for zephyr 7B alpha?

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

What speed will zephyr 7B alpha run at on RTX 4070 12GB?

On RTX 4070 12GB, zephyr 7B alpha achieves approximately 88.5 tokens per second decode speed with a time-to-first-token of 2187ms using Q4_K_M quantization.

Can RTX 4070 12GB run zephyr 7B alpha for coding?

For coding workloads, zephyr 7B alpha on RTX 4070 12GB receives a B grade with 88.5 tok/s and 104K context.

What context window can zephyr 7B alpha use on RTX 4070 12GB?

On RTX 4070 12GB, zephyr 7B alpha can safely use up to 104K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

See all results for RTX 4070 12GB See all hardware for zephyr 7B alpha

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