Qwen2.5 0.5B Instruct — Hardware Requirements & GPU Compatibility
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Qwen2.5 0.5B Instruct is the smallest instruction-tuned model in Alibaba Cloud's Qwen 2.5 family, with just 494 million parameters. It is designed for ultra-lightweight deployment scenarios where minimal hardware resources are available, running comfortably on virtually any modern GPU or even CPU-only configurations. Despite its tiny footprint, the model supports a 128K token context window and can handle basic chat, simple summarization, and lightweight instruction following. It is primarily useful for edge deployment, experimentation, and prototyping where model size is a critical constraint. Released under the Apache 2.0 license.
6.1M downloads
483 likesSpecifications
- Publisher
- Alibaba
- Family
- Qwen 2.5
- Parameters
- 494M
- Architecture
- Qwen2ForCausalLM
- Context Length
- 32,768 tokens
- Vocabulary Size
- 151,936
- Release Date
- 2024-09-25
- License
- Apache 2.0
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HuggingFace
How Much VRAM Does Qwen2.5 0.5B Instruct Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| IQ2_XS | 2.40 | 0.5 GB | 0.8 GB | 0.15 GB | Importance-weighted 2-bit, extra small |
| IQ2_M | 2.70 | 0.5 GB | 0.9 GB | 0.17 GB | Importance-weighted 2-bit, medium |
| IQ3_XS | 3.30 | 0.5 GB | 0.9 GB | 0.20 GB | Importance-weighted 3-bit, extra small |
| Q2_K | 3.40 | 0.5 GB | 0.9 GB | 0.21 GB | 2-bit quantization with K-quant improvements |
| Q3_K_S | 3.50 | 0.5 GB | 0.9 GB | 0.22 GB | 3-bit small quantization |
| IQ3_M | 3.60 | 0.6 GB | 0.9 GB | 0.22 GB | Importance-weighted 3-bit, medium |
| Q4_0 | 4.00 | 0.6 GB | 0.9 GB | 0.25 GB | 4-bit legacy quantization |
| Q3_K_M | 3.90 | 0.6 GB | 0.9 GB | 0.24 GB | 3-bit medium quantization |
| Q3_K_L | 4.10 | 0.6 GB | 1.0 GB | 0.25 GB | 3-bit large quantization |
| IQ4_XS | 4.30 | 0.6 GB | 1.0 GB | 0.27 GB | Importance-weighted 4-bit, compact |
| Q4_K_S | 4.50 | 0.6 GB | 1.0 GB | 0.28 GB | 4-bit small quantization |
| Q4_K_M | 4.80 | 0.6 GB | 1 GB | 0.30 GB | 4-bit medium quantization — most popular sweet spot |
| Q5_0 | 5.00 | 0.6 GB | 1.0 GB | 0.31 GB | 5-bit legacy quantization |
| Q4_K_L | 4.90 | 0.6 GB | 1.0 GB | 0.30 GB | 4-bit large quantization |
| Q5_K_S | 5.50 | 0.7 GB | 1.0 GB | 0.34 GB | 5-bit small quantization |
| Q5_K_L | 5.80 | 0.7 GB | 1.1 GB | 0.36 GB | 5-bit large quantization |
| Q5_K_M | 5.70 | 0.7 GB | 1.1 GB | 0.35 GB | 5-bit medium quantization — good quality/size tradeoff |
| Q6_K | 6.60 | 0.7 GB | 1.1 GB | 0.41 GB | 6-bit quantization, very good quality |
| Q8_0 | 8.00 | 0.8 GB | 1.2 GB | 0.49 GB | 8-bit quantization, near-lossless |
Which GPUs Can Run Qwen2.5 0.5B Instruct?
Q4_K_M · 0.6 GBQwen2.5 0.5B Instruct (Q4_K_M) requires 0.6 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 1+ GB is recommended. Using the full 33K context window can add up to 0.4 GB, bringing total usage to 1 GB. 35 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti.
Runs great
— Plenty of headroomWhich Devices Can Run Qwen2.5 0.5B Instruct?
Q4_K_M · 0.6 GB33 devices with unified memory can run Qwen2.5 0.5B Instruct, including NVIDIA DGX H100, NVIDIA DGX A100 640GB.
Runs great
— Plenty of headroomRelated Models
Derivatives (8)
Frequently Asked Questions
- How much VRAM does Qwen2.5 0.5B Instruct need?
Qwen2.5 0.5B Instruct requires 0.6 GB of VRAM at Q4_K_M, or 0.8 GB at Q8_0.
VRAM = Weights + KV Cache + Overhead
Weights = 494M × 4.8 bits ÷ 8 = 0.3 GB
KV Cache + Overhead ≈ 0.3 GB (at 2K context + ~0.3 GB framework)
KV Cache + Overhead ≈ 0.7 GB (at full 33K context)
VRAM usage by quantization
Q4_K_M0.6 GBQ4_K_M + full context1.0 GB- What's the best quantization for Qwen2.5 0.5B Instruct?
For Qwen2.5 0.5B Instruct, Q4_K_M (0.6 GB) offers the best balance of quality and VRAM usage. Q5_0 (0.6 GB) provides better quality if you have the VRAM. The smallest option is IQ2_XS at 0.5 GB.
VRAM requirement by quantization
IQ2_XS0.5 GB~57%IQ3_M0.6 GB~78%IQ4_XS0.6 GB~87%Q4_K_M ★0.6 GB~89%Q5_K_S0.7 GB~92%Q8_00.8 GB~99%★ Recommended — best balance of quality and VRAM usage.
- Can I run Qwen2.5 0.5B Instruct on a Mac?
Qwen2.5 0.5B Instruct requires at least 0.5 GB at IQ2_XS, 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 Qwen2.5 0.5B Instruct locally?
Yes — Qwen2.5 0.5B Instruct can run locally on consumer hardware. At Q4_K_M quantization it needs 0.6 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is Qwen2.5 0.5B Instruct?
At Q4_K_M, Qwen2.5 0.5B Instruct can reach ~4702 tok/s on AMD Instinct MI300X. On NVIDIA GeForce RTX 4090: ~1057 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 ÷ 0.6 × 0.55 = ~4702 tok/s
Estimated speed at Q4_K_M (0.6 GB)
AMD Instinct MI300X~4702 tok/sNVIDIA GeForce RTX 4090~1057 tok/sNVIDIA H100 SXM~3514 tok/sAMD Instinct MI250X~2907 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of Qwen2.5 0.5B Instruct?
At Q4_K_M, the download is about 0.30 GB. The full-precision Q8_0 version is 0.49 GB. The smallest option (IQ2_XS) is 0.15 GB.