LFM2 1.2B RAG — Hardware Requirements & GPU Compatibility
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731 downloads
112 likesSpecifications
- Publisher
- LiquidAI
- Parameters
- 1.2B
- Architecture
- Lfm2ForCausalLM
- Context Length
- 128,000 tokens
- Vocabulary Size
- 65,536
- Release Date
- 2025-12-05
- License
- Other
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HuggingFace
How Much VRAM Does LFM2 1.2B RAG Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| Q2_K | 3.40 | 0.9 GB | 5 GB | 0.51 GB | 2-bit quantization with K-quant improvements |
| Q3_K_S | 3.50 | 0.9 GB | 5.0 GB | 0.53 GB | 3-bit small quantization |
| Q3_K_M | 3.90 | 0.9 GB | 5.1 GB | 0.58 GB | 3-bit medium quantization |
| Q4_0 | 4.00 | 1.0 GB | 5.1 GB | 0.60 GB | 4-bit legacy quantization |
| Q4_K_M | 4.80 | 1.1 GB | 5.2 GB | 0.72 GB | 4-bit medium quantization — most popular sweet spot |
| Q5_K_M | 5.70 | 1.2 GB | 5.3 GB | 0.85 GB | 5-bit medium quantization — good quality/size tradeoff |
| Q6_K | 6.60 | 1.4 GB | 5.5 GB | 0.99 GB | 6-bit quantization, very good quality |
| Q8_0 | 8.00 | 1.6 GB | 5.7 GB | 1.20 GB | 8-bit quantization, near-lossless |
Which GPUs Can Run LFM2 1.2B RAG?
Q4_K_M · 1.1 GBLFM2 1.2B RAG (Q4_K_M) requires 1.1 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 2+ GB is recommended. Using the full 128K context window can add up to 4.1 GB, bringing total usage to 5.2 GB. 35 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti.
Runs great
— Plenty of headroomWhich Devices Can Run LFM2 1.2B RAG?
Q4_K_M · 1.1 GB33 devices with unified memory can run LFM2 1.2B RAG, including NVIDIA DGX H100, NVIDIA DGX A100 640GB.
Runs great
— Plenty of headroomRelated Models
Derivatives (1)
Frequently Asked Questions
- How much VRAM does LFM2 1.2B RAG need?
LFM2 1.2B RAG requires 1.1 GB of VRAM at Q4_K_M, or 1.6 GB at Q8_0. Full 128K context adds up to 4.1 GB (5.2 GB total).
VRAM = Weights + KV Cache + Overhead
Weights = 1.2B × 4.8 bits ÷ 8 = 0.7 GB
KV Cache + Overhead ≈ 0.4 GB (at 2K context + ~0.3 GB framework)
KV Cache + Overhead ≈ 4.5 GB (at full 128K context)
VRAM usage by quantization
Q4_K_M1.1 GBQ4_K_M + full context5.2 GB- What's the best quantization for LFM2 1.2B RAG?
For LFM2 1.2B RAG, Q4_K_M (1.1 GB) offers the best balance of quality and VRAM usage. Q5_K_S (1.2 GB) provides better quality if you have the VRAM. The smallest option is Q2_K at 0.9 GB.
VRAM requirement by quantization
Q2_K0.9 GB~75%Q4_01.0 GB~85%Q4_K_S1.0 GB~88%Q4_K_M ★1.1 GB~89%Q5_K_M1.2 GB~92%Q8_01.6 GB~99%★ Recommended — best balance of quality and VRAM usage.
- Can I run LFM2 1.2B RAG on a Mac?
LFM2 1.2B RAG requires at least 0.9 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 1.2B RAG locally?
Yes — LFM2 1.2B RAG can run locally on consumer hardware. At Q4_K_M quantization it needs 1.1 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is LFM2 1.2B RAG?
At Q4_K_M, LFM2 1.2B RAG can reach ~2674 tok/s on AMD Instinct MI300X. On NVIDIA GeForce RTX 4090: ~601 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 ÷ 1.1 × 0.55 = ~2674 tok/s
Estimated speed at Q4_K_M (1.1 GB)
AMD Instinct MI300X~2674 tok/sNVIDIA GeForce RTX 4090~601 tok/sNVIDIA H100 SXM~1999 tok/sAMD Instinct MI250X~1653 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of LFM2 1.2B RAG?
At Q4_K_M, the download is about 0.72 GB. The full-precision Q8_0 version is 1.20 GB. The smallest option (Q2_K) is 0.51 GB.
- Which GPUs can run LFM2 1.2B RAG?
35 consumer GPUs can run LFM2 1.2B RAG at Q4_K_M (1.1 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 LFM2 1.2B RAG?
33 devices with unified memory can run LFM2 1.2B RAG at Q4_K_M (1.1 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.