LFM2.5 2.6B Hex — Hardware Requirements & GPU Compatibility
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LFM2.5 2.6B Hex is a 2.6B-parameter open language model from hxii in the LFM2.5 family. At Q4_K_M it needs about 1.72 GB of VRAM — see which GPUs and Macs can run it below.
111 downloads
2 likesSpecifications
- Publisher
- hxii
- Family
- LFM2.5
- Parameters
- 2.6B
- Release Date
- 2026-08-28
- License
- Other
Get Started
HuggingFace
How Much VRAM Does LFM2.5 2.6B Hex Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| Q2_Kest. | 3.40 | 1.2 GB | — | 1.10 GB | 2-bit quantization with K-quant improvements |
| Q3_K_Mest. | 3.90 | 1.4 GB | — | 1.27 GB | 3-bit medium quantization |
| Q4_K_Mest. | 4.80 | 1.7 GB | — | 1.56 GB | 4-bit medium quantization — most popular sweet spot |
| Q5_K_Mest. | 5.70 | 2.0 GB | — | 1.85 GB | 5-bit medium quantization — good quality/size tradeoff |
| Q6_Kest. | 6.60 | 2.4 GB | — | 2.15 GB | 6-bit quantization, very good quality |
| Q8_0 | 8.00 | 2.9 GB | — | 2.60 GB | 8-bit quantization, near-lossless |
| BF16est. | 16.00 | 5.7 GB | — | 5.20 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 LFM2.5 2.6B Hex?
Q4_K_M · 1.7 GBLFM2.5 2.6B Hex (Q4_K_M) requires 1.7 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 3+ GB is recommended. 50 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti.
Runs great
— Plenty of headroomWhich Devices Can Run LFM2.5 2.6B Hex?
Q4_K_M · 1.7 GB59 devices with unified memory can run LFM2.5 2.6B Hex, including NVIDIA DGX H100, NVIDIA DGX A100 640GB.
Runs great
— Plenty of headroomRelated Models
Frequently Asked Questions
- How much VRAM does LFM2.5 2.6B Hex need?
LFM2.5 2.6B Hex requires 1.7 GB of VRAM at Q4_K_M, or 5.7 GB at BF16.
VRAM = Weights + KV Cache + Overhead
Weights = 2.6B × 4.8 bits ÷ 8 = 1.6 GB
KV Cache + Overhead ≈ 0.1 GB (at 2K context + ~0.3 GB framework)
VRAM usage by quantization
Q4_K_M1.7 GB- What's the best quantization for LFM2.5 2.6B Hex?
For LFM2.5 2.6B Hex, Q4_K_M (1.7 GB) offers the best balance of quality and VRAM usage. Q5_K_M (2.0 GB) provides better quality if you have the VRAM. The smallest option is Q2_K at 1.2 GB.
VRAM requirement by quantization
Q2_K1.2 GBQ4_K_M ★1.7 GBQ5_K_M2.0 GBQ6_K2.4 GBQ8_02.9 GBBF165.7 GB★ Recommended — best balance of quality and VRAM usage.
- Can I run LFM2.5 2.6B Hex on a Mac?
LFM2.5 2.6B Hex requires at least 1.2 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 LFM2.5 2.6B Hex locally?
Yes — LFM2.5 2.6B Hex can run locally on consumer hardware. At Q4_K_M quantization it needs 1.7 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is LFM2.5 2.6B Hex?
At Q4_K_M, LFM2.5 2.6B Hex can reach ~2791 tok/s on AMD Instinct MI350X. On NVIDIA GeForce RTX 4090: ~381 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 ÷ 1.7 × 0.65 = ~3023 tok/s
Estimated speed at Q4_K_M (1.7 GB)
~3023 tok/s~381 tok/s~3023 tok/s~2791 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of LFM2.5 2.6B Hex?
At Q4_K_M, the download is about 1.56 GB. The full-precision BF16 version is 5.20 GB. The smallest option (Q2_K) is 1.10 GB.
- Which GPUs can run LFM2.5 2.6B Hex?
50 consumer GPUs can run LFM2.5 2.6B Hex at Q4_K_M (1.7 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 LFM2.5 2.6B Hex?
59 devices with unified memory can run LFM2.5 2.6B Hex at Q4_K_M (1.7 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.