AFM 4.5B — Hardware Requirements & GPU Compatibility
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AFM 4.5B is a 4.6B-parameter open language model from Arcee AI. It supports a context window of up to 65,536 tokens. At Q4_K_M it needs about 3.22 GB of VRAM — see which GPUs and Macs can run it below.
1.5K downloads
95 likesSpecifications
- Publisher
- Arcee AI
- Parameters
- 4.6B
- Architecture
- ArceeForCausalLM
- Context Length
- 65,536 tokens
- Vocabulary Size
- 128,005
- Release Date
- 2025-07-29
- License
- Apache 2.0
Get Started
HuggingFace
How Much VRAM Does AFM 4.5B Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| Q2_Kest. | 3.40 | 2.4 GB | 7.1 GB | 1.96 GB | 2-bit quantization with K-quant improvements |
| Q3_K_Mest. | 3.90 | 2.7 GB | 7.4 GB | 2.25 GB | 3-bit medium quantization |
| Q4_K_Mest. | 4.80 | 3.2 GB | 7.9 GB | 2.77 GB | 4-bit medium quantization — most popular sweet spot |
| Q5_K_Mest. | 5.70 | 3.7 GB | 8.4 GB | 3.29 GB | 5-bit medium quantization — good quality/size tradeoff |
| Q6_Kest. | 6.60 | 4.3 GB | 8.9 GB | 3.81 GB | 6-bit quantization, very good quality |
| Q8_0est. | 8.00 | 5.1 GB | 9.8 GB | 4.62 GB | 8-bit quantization, near-lossless |
| BF16est. | 16.00 | 9.7 GB | 14.4 GB | 9.24 GB | Brain floating point 16 — preferred for training |
est.= calculated VRAM estimate; no published GGUF file found for that quantization yet. Other rows are verified against real community uploads.
Which GPUs Can Run AFM 4.5B?
Q4_K_M · 3.2 GBAFM 4.5B (Q4_K_M) requires 3.2 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 5+ GB is recommended. Using the full 66K context window can add up to 4.7 GB, bringing total usage to 7.9 GB. 50 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti.
Runs great
— Plenty of headroomWhich Devices Can Run AFM 4.5B?
Q4_K_M · 3.2 GB59 devices with unified memory can run AFM 4.5B, including NVIDIA DGX H100, NVIDIA DGX A100 640GB.
Runs great
— Plenty of headroomFrequently Asked Questions
- How much VRAM does AFM 4.5B need?
AFM 4.5B requires 3.2 GB of VRAM at Q4_K_M, or 9.7 GB at BF16. Full 66K context adds up to 4.7 GB (7.9 GB total).
VRAM = Weights + KV Cache + Overhead
Weights = 4.6B × 4.8 bits ÷ 8 = 2.8 GB
KV Cache + Overhead ≈ 0.4 GB (at 2K context + ~0.3 GB framework)
KV Cache + Overhead ≈ 5.1 GB (at full 66K context)
VRAM usage by quantization
Q4_K_M3.2 GBQ4_K_M + full context7.9 GB- What's the best quantization for AFM 4.5B?
For AFM 4.5B, Q4_K_M (3.2 GB) offers the best balance of quality and VRAM usage. Q5_K_M (3.7 GB) provides better quality if you have the VRAM. The smallest option is Q2_K at 2.4 GB.
VRAM requirement by quantization
Q2_K2.4 GBQ4_K_M ★3.2 GBQ5_K_M3.7 GBQ6_K4.3 GBQ8_05.1 GBBF169.7 GB★ Recommended — best balance of quality and VRAM usage.
- Can I run AFM 4.5B on a Mac?
AFM 4.5B requires at least 2.4 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 AFM 4.5B locally?
Yes — AFM 4.5B can run locally on consumer hardware. At Q4_K_M quantization it needs 3.2 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is AFM 4.5B?
At Q4_K_M, AFM 4.5B can reach ~1367 tok/s on AMD Instinct MI350X. On NVIDIA GeForce RTX 4090: ~204 tok/s. Speed depends mainly on GPU memory bandwidth. Real-world results typically within ±20%.
tok/s = (bandwidth GB/s ÷ model GB) × efficiency
Example: NVIDIA B200 → 8000 ÷ 3.2 × 0.65 = ~1615 tok/s
Estimated speed at Q4_K_M (3.2 GB)
~1615 tok/s~204 tok/s~1615 tok/s~1367 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of AFM 4.5B?
At Q4_K_M, the download is about 2.77 GB. The full-precision BF16 version is 9.24 GB. The smallest option (Q2_K) is 1.96 GB.
- Which GPUs can run AFM 4.5B?
50 consumer GPUs can run AFM 4.5B at Q4_K_M (3.2 GB). Top options include AMD Radeon RX 6700 XT, AMD Radeon RX 6800, AMD Radeon RX 6800 XT. 50 GPUs have plenty of headroom for comfortable inference.
- Which devices can run AFM 4.5B?
59 devices with unified memory can run AFM 4.5B at Q4_K_M (3.2 GB), including AMD Ryzen AI 9 HX 370 (Strix Point) Laptop, ASUS Ascent GX10, Apple iPhone 17 Pro, Asus ROG Flow Z13 (2025, Ryzen AI Max+ 395, 128 GB). Apple Silicon Macs use unified memory shared between CPU and GPU, making them well-suited for local LLM inference.