Jan Code 4B GGUF — Hardware Requirements & GPU Compatibility
ChatFunctionsCode
13.8K downloads
47 likesSpecifications
- Publisher
- janhq
- Parameters
- 4B
- Release Date
- 2026-03-04
- License
- Apache 2.0
Get Started
HuggingFace
How Much VRAM Does Jan Code 4B GGUF Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| Q3_K_S | 3.50 | 1.9 GB | — | 1.75 GB | 3-bit small quantization |
| Q3_K_M | 3.90 | 2.1 GB | — | 1.95 GB | 3-bit medium quantization |
| Q4_0 | 4.00 | 2.2 GB | — | 2.00 GB | 4-bit legacy quantization |
| Q4_K_M | 4.80 | 2.6 GB | — | 2.40 GB | 4-bit medium quantization — most popular sweet spot |
| Q5_K_M | 5.70 | 3.1 GB | — | 2.85 GB | 5-bit medium quantization — good quality/size tradeoff |
| Q6_K | 6.60 | 3.6 GB | — | 3.30 GB | 6-bit quantization, very good quality |
| Q8_0 | 8.00 | 4.4 GB | — | 4.00 GB | 8-bit quantization, near-lossless |
Which GPUs Can Run Jan Code 4B GGUF?
Q4_K_M · 2.6 GBJan Code 4B GGUF (Q4_K_M) requires 2.6 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 4+ 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 Jan Code 4B GGUF?
Q4_K_M · 2.6 GB33 devices with unified memory can run Jan Code 4B GGUF, including NVIDIA DGX H100, NVIDIA DGX A100 640GB.
Runs great
— Plenty of headroomRelated Models
Frequently Asked Questions
- How much VRAM does Jan Code 4B GGUF need?
Jan Code 4B GGUF requires 2.6 GB of VRAM at Q4_K_M, or 4.4 GB at Q8_0.
VRAM = Weights + KV Cache + Overhead
Weights = 4B × 4.8 bits ÷ 8 = 2.4 GB
KV Cache + Overhead ≈ 0.2 GB (at 2K context + ~0.3 GB framework)
VRAM usage by quantization
Q4_K_M2.6 GB- What's the best quantization for Jan Code 4B GGUF?
For Jan Code 4B GGUF, Q4_K_M (2.6 GB) offers the best balance of quality and VRAM usage. Q5_0 (2.8 GB) provides better quality if you have the VRAM. The smallest option is Q3_K_S at 1.9 GB.
VRAM requirement by quantization
Q3_K_S1.9 GB~77%Q3_K_L2.3 GB~86%Q4_K_M ★2.6 GB~89%Q5_02.8 GB~90%Q5_K_S3.0 GB~92%Q8_04.4 GB~99%★ Recommended — best balance of quality and VRAM usage.
- Can I run Jan Code 4B GGUF on a Mac?
Jan Code 4B GGUF requires at least 1.9 GB at Q3_K_S, 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 Jan Code 4B GGUF locally?
Yes — Jan Code 4B GGUF can run locally on consumer hardware. At Q4_K_M quantization it needs 2.6 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is Jan Code 4B GGUF?
At Q4_K_M, Jan Code 4B GGUF can reach ~1104 tok/s on AMD Instinct MI300X. On NVIDIA GeForce RTX 4090: ~248 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 ÷ 2.6 × 0.55 = ~1104 tok/s
Estimated speed at Q4_K_M (2.6 GB)
AMD Instinct MI300X~1104 tok/sNVIDIA GeForce RTX 4090~248 tok/sNVIDIA H100 SXM~825 tok/sAMD Instinct MI250X~683 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of Jan Code 4B GGUF?
At Q4_K_M, the download is about 2.40 GB. The full-precision Q8_0 version is 4.00 GB. The smallest option (Q3_K_S) is 1.75 GB.
- Which GPUs can run Jan Code 4B GGUF?
35 consumer GPUs can run Jan Code 4B GGUF at Q4_K_M (2.6 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 Jan Code 4B GGUF?
33 devices with unified memory can run Jan Code 4B GGUF at Q4_K_M (2.6 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.