Models · chat and writing, image understanding
Qwen3.5 4B: VRAM requirements and GPUs that run it
Small 2026 model with vision and hybrid attention, so long context costs very little memory. At Q4 with 8K context it needs about 3.9 GB, so you want a GPU with at least 6 GB of VRAM or a Mac with 8 GB of unified memory.
Memory needed by quantization
| Quant | Weights | Total at 8K | Total at 32K |
|---|---|---|---|
| Q4_K_M | 3.1 GB | 3.9 GB | 4.7 GB |
| Q5_K_M | 3.7 GB | 4.5 GB | 5.4 GB |
| Q8_0 | 5.5 GB | 6.4 GB | 7.2 GB |
| FP16 | 10 GB | 11 GB | 12 GB |
Totals include about 10% runtime overhead and the KV cache, plus around 0.6 GB for the vision encoder. Its conversation memory (KV cache) is unusually small, so going from 8K to 32K context adds only about 0.8 GB. Most people should download Q4_K_M; Q5 or Q8 only make sense if you have spare memory. Read which quantization to pick.
Which GPUs can run Qwen3.5 4B?
39 of the 40 cards we track run it fully in VRAM at 8K context. The cheapest entry point is a 6 GB card such as the GTX 1660 / 1660 Super, and the fastest is the RTX 5090 at about 230 tokens per second. 1 more can run it with part of the model in system RAM, which is noticeably slower.
| GPU | VRAM | Status | Quant | Speed |
|---|---|---|---|---|
| RTX 5090 | 32 GB | Runs well | Q8_0 | ~230 tok/s |
| RTX 4090 | 24 GB | Runs well | Q8_0 | ~130 tok/s |
| RTX 5080 | 16 GB | Runs well | Q8_0 | ~130 tok/s |
| RX 7900 XTX | 24 GB | Runs well | Q8_0 | ~130 tok/s |
| RTX 3090 / 3090 Ti | 24 GB | Runs well | Q8_0 | ~120 tok/s |
| RTX 5070 Ti | 16 GB | Runs well | Q8_0 | ~120 tok/s |
| RX 7900 XT | 20 GB | Runs well | Q8_0 | ~100 tok/s |
| RTX 3080 | 10 GB | Runs well | Q8_0 | ~99 tok/s |
| RTX 4080 / 4080 Super | 16 GB | Runs well | Q8_0 | ~96 tok/s |
| RTX 5070 | 12 GB | Runs well | Q8_0 | ~88 tok/s |
| RTX 4070 Ti Super | 16 GB | Runs well | Q8_0 | ~88 tok/s |
| RX 9070 XT | 16 GB | Runs well | Q8_0 | ~84 tok/s |
| RX 7800 XT | 16 GB | Runs well | Q8_0 | ~81 tok/s |
| RTX 4090 Laptop | 16 GB | Runs well | Q8_0 | ~75 tok/s |
| Arc A770 | 16 GB | Runs well | Q8_0 | ~73 tok/s |
| Arc A750 | 8 GB | Runs well | Q8_0 | ~67 tok/s |
| RX 6800 XT | 16 GB | Runs well | Q8_0 | ~67 tok/s |
| RTX 4070 / 4070 Super | 12 GB | Runs well | Q8_0 | ~66 tok/s |
| GTX 1080 Ti | 11 GB | Runs well | Q8_0 | ~63 tok/s |
| Arc B580 | 12 GB | Runs well | Q8_0 | ~59 tok/s |
| RTX 5060 Ti | 8 GB | Runs well | Q8_0 | ~58 tok/s |
| RTX 5060 | 8 GB | Runs well | Q8_0 | ~58 tok/s |
| RTX 3070 / 3070 Ti | 8 GB | Runs well | Q8_0 | ~58 tok/s |
| RTX 3060 Ti | 8 GB | Runs well | Q8_0 | ~58 tok/s |
| RTX 5060 Ti | 16 GB | Runs well | Q8_0 | ~58 tok/s |
| GTX 1660 / 1660 Super | 6 GB | Runs well | Q6_K | ~57 tok/s |
| RTX 3060 Laptop | 6 GB | Runs well | Q6_K | ~57 tok/s |
| RTX 4080 Laptop | 12 GB | Runs well | Q8_0 | ~56 tok/s |
| RX 7700 XT | 12 GB | Runs well | Q8_0 | ~56 tok/s |
| RX 6700 XT | 12 GB | Runs well | Q8_0 | ~50 tok/s |
| RTX 3060 | 12 GB | Runs well | Q8_0 | ~47 tok/s |
| RTX 4060 Ti | 8 GB | Runs well | Q8_0 | ~38 tok/s |
| RX 7600 | 8 GB | Runs well | Q8_0 | ~38 tok/s |
| RTX 4060 Ti | 16 GB | Runs well | Q8_0 | ~38 tok/s |
| RTX 4060 | 8 GB | Runs well | Q8_0 | ~35 tok/s |
| RTX 4070 Laptop | 8 GB | Runs well | Q8_0 | ~33 tok/s |
| RTX 4060 Laptop | 8 GB | Runs well | Q8_0 | ~33 tok/s |
| RTX 4050 Laptop | 6 GB | Runs well | Q6_K | ~32 tok/s |
| RTX 3050 | 8 GB | Runs well | Q8_0 | ~29 tok/s |
| GTX 1650 | 4 GB | Offload | Q4_K_M | ~5.2 tok/s |
Running it on a Mac
Apple Silicon Macs can give a model about 72% of their unified memory. Qwen3.5 4B fits from 8 GB (Apple M1, about 11 tokens per second). With a faster chip like the Apple M3 Ultra (96 GB) expect around 110 tokens per second. Compare the options in our Mac vs NVIDIA guide.
Similar size models: Llama 3.2 3B, Phi-4 Mini 3.8B, Qwen3 4B, Gemma 3 4B.
Compare Qwen3.5 4B
Questions
How much VRAM does Qwen3.5 4B need?
About 3.9 GB at Q4_K_M with 8K context, 6.4 GB at Q8_0, and 11 GB at full FP16. In practice that means a card with at least 6 GB of VRAM for Q4.
Can Qwen3.5 4B run on an 8 GB GPU?
Yes, at Q8_0, using about 6.4 GB.
Can I run Qwen3.5 4B on a Mac?
Yes. The smallest configuration that runs it fully is Apple M1 with 8 GB of unified memory, at about 11 tokens per second. More memory bandwidth (Pro, Max, Ultra chips) means faster replies.
Estimates based on model size, architecture and memory bandwidth. Real numbers vary with software, drivers and context length.