Llama 3.1 8B Instruct — Hardware Requirements & GPU Compatibility
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Meta Llama 3.1 8B Instruct is an 8-billion parameter instruction-tuned language model from Meta. Part of the Llama 3.1 release, it supports a 128K token context window and is fine-tuned for conversational use, tool calling, and general assistant tasks. Its compact size makes it well-suited for local deployment on modern consumer GPUs with 8GB or more of VRAM. Llama 3.1 8B Instruct delivers strong performance for its parameter class across benchmarks in reasoning, coding, and multilingual understanding. It is released under the Llama 3.1 Community License and is widely supported by inference frameworks such as llama.cpp, vLLM, and Ollama.
7.3M downloads
5.6K likesSpecifications
- Publisher
- Meta
- Family
- Llama 3
- Parameters
- 8B
- Context Length
- 131,072 tokens
- Release Date
- 2024-09-25
- License
- Llama 3.1 Community
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HuggingFace
How Much VRAM Does Llama 3.1 8B Instruct Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| IQ2_XXS | 2.20 | 2.4 GB | — | 2.20 GB | Importance-weighted 2-bit, extreme compression — significant quality loss |
| IQ2_M | 2.70 | 3.0 GB | — | 2.70 GB | Importance-weighted 2-bit, medium |
| IQ3_XXS | 3.10 | 3.4 GB | — | 3.10 GB | Importance-weighted 3-bit |
| IQ3_XS | 3.30 | 3.6 GB | — | 3.30 GB | Importance-weighted 3-bit, extra small |
| Q2_K | 3.40 | 3.7 GB | — | 3.40 GB | 2-bit quantization with K-quant improvements |
| Q3_K_S | 3.50 | 3.9 GB | — | 3.50 GB | 3-bit small quantization |
| IQ3_M | 3.60 | 4.0 GB | — | 3.60 GB | Importance-weighted 3-bit, medium |
| Q3_K_M | 3.90 | 4.3 GB | — | 3.90 GB | 3-bit medium quantization |
| Q4_0 | 4.00 | 4.4 GB | — | 4.00 GB | 4-bit legacy quantization |
| Q3_K_L | 4.10 | 4.5 GB | — | 4.10 GB | 3-bit large quantization |
| IQ4_XS | 4.30 | 4.7 GB | — | 4.30 GB | Importance-weighted 4-bit, compact |
| IQ4_NL | 4.50 | 5.0 GB | — | 4.50 GB | Importance-weighted 4-bit, non-linear |
| Q4_K_S | 4.50 | 5.0 GB | — | 4.50 GB | 4-bit small quantization |
| Q4_1 | 4.50 | 5.0 GB | — | 4.50 GB | 4-bit legacy quantization with offset |
| Q4_K_M | 4.80 | 5.3 GB | — | 4.80 GB | 4-bit medium quantization — most popular sweet spot |
| Q4_K_L | 4.90 | 5.4 GB | — | 4.90 GB | 4-bit large quantization |
| Q5_K_S | 5.50 | 6.0 GB | — | 5.50 GB | 5-bit small quantization |
| Q5_K_M | 5.70 | 6.3 GB | — | 5.70 GB | 5-bit medium quantization — good quality/size tradeoff |
| Q5_K_L | 5.80 | 6.4 GB | — | 5.80 GB | 5-bit large quantization |
| Q6_K | 6.60 | 7.3 GB | — | 6.60 GB | 6-bit quantization, very good quality |
| Q8_0 | 8.00 | 8.8 GB | — | 8.00 GB | 8-bit quantization, near-lossless |
Which GPUs Can Run Llama 3.1 8B Instruct?
Q4_K_M · 5.3 GBLlama 3.1 8B Instruct (Q4_K_M) requires 5.3 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 7+ GB is recommended. 35 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti.
Runs great
— Plenty of headroomWhich Devices Can Run Llama 3.1 8B Instruct?
Q4_K_M · 5.3 GB33 devices with unified memory can run Llama 3.1 8B Instruct, including NVIDIA DGX H100, NVIDIA DGX A100 640GB.
Runs great
— Plenty of headroomRelated Models
Derivatives (4)
Frequently Asked Questions
- How much VRAM does Llama 3.1 8B Instruct need?
Llama 3.1 8B Instruct requires 5.3 GB of VRAM at Q4_K_M, or 8.8 GB at Q8_0.
VRAM = Weights + KV Cache + Overhead
Weights = 8B × 4.8 bits ÷ 8 = 4.8 GB
KV Cache + Overhead ≈ 0.5 GB (at 2K context + ~0.3 GB framework)
VRAM usage by quantization
Q4_K_M5.3 GB- What's the best quantization for Llama 3.1 8B Instruct?
For Llama 3.1 8B Instruct, Q4_K_M (5.3 GB) offers the best balance of quality and VRAM usage. Q4_K_L (5.4 GB) provides better quality if you have the VRAM. The smallest option is IQ2_XXS at 2.4 GB.
VRAM requirement by quantization
IQ2_XXS2.4 GB~53%Q3_K_S3.9 GB~77%IQ4_XS4.7 GB~87%Q4_K_M ★5.3 GB~89%Q4_K_L5.4 GB~90%Q8_08.8 GB~99%★ Recommended — best balance of quality and VRAM usage.
- Can I run Llama 3.1 8B Instruct on a Mac?
Llama 3.1 8B Instruct requires at least 2.4 GB at IQ2_XXS, which exceeds the unified memory of most consumer Macs. You would need a Mac Studio or Mac Pro with a high-memory configuration.
- Can I run Llama 3.1 8B Instruct locally?
Yes — Llama 3.1 8B Instruct can run locally on consumer hardware. At Q4_K_M quantization it needs 5.3 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is Llama 3.1 8B Instruct?
At Q4_K_M, Llama 3.1 8B Instruct can reach ~552 tok/s on AMD Instinct MI300X. On NVIDIA GeForce RTX 4090: ~124 tok/s. Speed depends mainly on GPU memory bandwidth. Real-world results typically within ±20%.
tok/s = (bandwidth GB/s ÷ model GB) × efficiency
Example: AMD Instinct MI300X → 5300 ÷ 5.3 × 0.55 = ~552 tok/s
Estimated speed at Q4_K_M (5.3 GB)
AMD Instinct MI300X~552 tok/sNVIDIA GeForce RTX 4090~124 tok/sNVIDIA H100 SXM~413 tok/sAMD Instinct MI250X~341 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of Llama 3.1 8B Instruct?
At Q4_K_M, the download is about 4.80 GB. The full-precision Q8_0 version is 8.00 GB. The smallest option (IQ2_XXS) is 2.20 GB.