Qwen3.5 4B Abliterated — Hardware Requirements & GPU Compatibility
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Qwen3.5 4B Abliterated is a 4.2B-parameter open language model from wangzhang in the Qwen family. It supports a context window of up to 262,144 tokens. At Q4_K_M it needs about 2.99 GB of VRAM — see which GPUs and Macs can run it below.
32 downloads
2 likesSpecifications
- Publisher
- wangzhang
- Family
- Qwen
- Parameters
- 4.2B
- Architecture
- Qwen3_5ForCausalLM
- Context Length
- 262,144 tokens
- Vocabulary Size
- 248,320
- Release Date
- 2026-03-12
- License
- Apache 2.0
Get Started
HuggingFace
How Much VRAM Does Qwen3.5 4B Abliterated Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| Q2_K | 3.40 | 2.3 GB | 23.6 GB | 1.79 GB | 2-bit quantization with K-quant improvements |
| Q3_K_S | 3.50 | 2.3 GB | 23.6 GB | 1.84 GB | 3-bit small quantization |
| Q3_K_M | 3.90 | 2.5 GB | 23.8 GB | 2.05 GB | 3-bit medium quantization |
| Q3_K_L | 4.10 | 2.6 GB | 23.9 GB | 2.16 GB | 3-bit large quantization |
| Q4_K_S | 4.50 | 2.8 GB | 24.1 GB | 2.37 GB | 4-bit small quantization |
| Q4_K_M | 4.80 | 3.0 GB | 24.3 GB | 2.52 GB | 4-bit medium quantization — most popular sweet spot |
| Q5_K_S | 5.50 | 3.4 GB | 24.7 GB | 2.89 GB | 5-bit small quantization |
| Q5_K_M | 5.70 | 3.5 GB | 24.8 GB | 3.00 GB | 5-bit medium quantization — good quality/size tradeoff |
| Q6_K | 6.60 | 3.9 GB | 25.2 GB | 3.47 GB | 6-bit quantization, very good quality |
| Q8_0 | 8.00 | 4.7 GB | 26.0 GB | 4.21 GB | 8-bit quantization, near-lossless |
Which GPUs Can Run Qwen3.5 4B Abliterated?
Q4_K_M · 3.0 GBQwen3.5 4B Abliterated (Q4_K_M) requires 3.0 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 4+ GB is recommended. Using the full 262K context window can add up to 21.3 GB, bringing total usage to 24.3 GB. 35 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti.
Runs great
— Plenty of headroomWhich Devices Can Run Qwen3.5 4B Abliterated?
Q4_K_M · 3.0 GB33 devices with unified memory can run Qwen3.5 4B Abliterated, including NVIDIA DGX H100, NVIDIA DGX A100 640GB.
Runs great
— Plenty of headroomRelated Models
Frequently Asked Questions
- How much VRAM does Qwen3.5 4B Abliterated need?
Qwen3.5 4B Abliterated requires 3.0 GB of VRAM at Q4_K_M, or 4.7 GB at Q8_0. Full 262K context adds up to 21.3 GB (24.3 GB total).
VRAM = Weights + KV Cache + Overhead
Weights = 4.2B × 4.8 bits ÷ 8 = 2.5 GB
KV Cache + Overhead ≈ 0.5 GB (at 2K context + ~0.3 GB framework)
KV Cache + Overhead ≈ 21.8 GB (at full 262K context)
VRAM usage by quantization
Q4_K_M3.0 GBQ4_K_M + full context24.3 GB- What's the best quantization for Qwen3.5 4B Abliterated?
For Qwen3.5 4B Abliterated, Q4_K_M (3.0 GB) offers the best balance of quality and VRAM usage. Q5_K_S (3.4 GB) provides better quality if you have the VRAM. The smallest option is Q2_K at 2.3 GB.
VRAM requirement by quantization
Q2_K2.3 GBQ3_K_M2.5 GBQ4_K_M ★3.0 GBQ5_K_S3.4 GBQ5_K_M3.5 GBQ8_04.7 GB★ Recommended — best balance of quality and VRAM usage.
- Can I run Qwen3.5 4B Abliterated on a Mac?
Qwen3.5 4B Abliterated requires at least 2.3 GB at Q2_K, 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 Qwen3.5 4B Abliterated locally?
Yes — Qwen3.5 4B Abliterated can run locally on consumer hardware. At Q4_K_M quantization it needs 3.0 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is Qwen3.5 4B Abliterated?
At Q4_K_M, Qwen3.5 4B Abliterated can reach ~975 tok/s on AMD Instinct MI300X. On NVIDIA GeForce RTX 4090: ~219 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 ÷ 3.0 × 0.55 = ~975 tok/s
Estimated speed at Q4_K_M (3.0 GB)
~975 tok/s~219 tok/s~729 tok/s~603 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of Qwen3.5 4B Abliterated?
At Q4_K_M, the download is about 2.52 GB. The full-precision Q8_0 version is 4.21 GB. The smallest option (Q2_K) is 1.79 GB.
- Which GPUs can run Qwen3.5 4B Abliterated?
35 consumer GPUs can run Qwen3.5 4B Abliterated at Q4_K_M (3.0 GB). Top options include AMD Radeon RX 6700 XT, AMD Radeon RX 6800, AMD Radeon RX 6800 XT. 35 GPUs have plenty of headroom for comfortable inference.
- Which devices can run Qwen3.5 4B Abliterated?
33 devices with unified memory can run Qwen3.5 4B Abliterated at Q4_K_M (3.0 GB), including Mac Mini M4 (16 GB), Mac Mini M4 (32 GB), Mac Mini M4 Pro (24 GB), Mac Mini M4 Pro (48 GB). Apple Silicon Macs use unified memory shared between CPU and GPU, making them well-suited for local LLM inference.