How much memory does Llama 3.1 8B Instruct need at Q4?

The Q4 figure used here is 4.9 GB. GGUF file size from the linked Hub repo. KV cache was not added, because this model's attention shape is not in the catalog.

What is the cheapest catalog device that runs Llama 3.1 8B Instruct at Q4?

GeForce RTX 5050, list price $249.

How fast is Llama 3.1 8B Instruct on the GeForce RTX 4080 Super, as a bandwidth estimate?

About 91.7 tok/s at Q8. That is device bandwidth divided by active weight bytes, not a measured run.

Yes. Llama 3.1 8B Instruct fits on the GeForce RTX 4080 Super at Q8, with 5.6 GB of headroom. Usable memory is 15.2 GB.

Can the GeForce RTX 4080 Super run Llama 3.1 8B Instruct?

Data updated 16 October 2026. Last reviewed the same day, when this catalog snapshot was written.

Usable memory on this 16 GB VRAM config is 15.2 GB (95% of the sticker figure). A result under 2 GB of headroom is labeled tight.

Quant ladder

Estimated memory for Llama 3.1 8B Instruct on GeForce RTX 4080 Super
Quant	Estimate	Headroom	Est. tok/s	Verdict
Q4	4.9 GB	10.3 GB	150 tok/s	Yes
Q8	9.6 GB	5.6 GB	91.7 tok/s	Yes
FP16	19.3 GB	-4.1 GB	45.8 tok/s	No

GGUF file size from the linked Hub repo. KV cache was not added, because this model's attention shape is not in the catalog.
Formula estimate: parameter count × bytes per weight × 1.20. No GGUF file size is stored for this quant.
Tokens/sec is a bandwidth roofline: GB/s divided by active weight GB. It is not a measured generation speed.

KV cache at 8K and 32K

No KV-cache estimate. The public config for this model was gated, missing, or not a GQA or MLA shape this catalog knows how to read.

Offload

The Q4 weight estimate fits in usable VRAM, so this page does not assume a system-RAM offload.

Ollama

This command pulls the Q4_K_M file from unsloth/Llama-3.1-8B-Instruct-GGUF, the Hub repo whose file size is used above. It is not an official Ollama library tag.

ollama run hf.co/unsloth/Llama-3.1-8B-Instruct-GGUF:Q4_K_M

Other picks

Cheapest catalog device at Q4: GeForce RTX 5050
Closest catalog model that still fits at Q4: gpt-oss-20b.

All hardware for Llama 3.1 8B Instruct · All models for the GeForce RTX 4080 Super

Questions

How much memory does Llama 3.1 8B Instruct need at Q4?: The Q4 figure used here is 4.9 GB. GGUF file size from the linked Hub repo. KV cache was not added, because this model's attention shape is not in the catalog.
Can the GeForce RTX 4080 Super run Llama 3.1 8B Instruct?: Yes. Llama 3.1 8B Instruct fits on the GeForce RTX 4080 Super at Q8, with 5.6 GB of headroom. Usable memory is 15.2 GB.
What is the cheapest catalog device that runs Llama 3.1 8B Instruct at Q4?: GeForce RTX 5050, list price $249.
How fast is Llama 3.1 8B Instruct on the GeForce RTX 4080 Super, as a bandwidth estimate?: About 91.7 tok/s at Q8. That is device bandwidth divided by active weight bytes, not a measured run.