GLM 4.7 Flash Heretic 1.2.0 — Hardware Requirements & GPU Compatibility
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GLM 4.7 Flash Heretic 1.2.0 is a 29.9B-parameter open language model from darkc0de in the GLM family. It supports a context window of up to 202,752 tokens. At Q4_K_M it needs about 19.05 GB of VRAM — see which GPUs and Macs can run it below.
333 downloads
8 likesSpecifications
- Publisher
- darkc0de
- Family
- GLM
- Parameters
- 29.9B
- Architecture
- Glm4MoeLiteForCausalLM
- Context Length
- 202,752 tokens
- Vocabulary Size
- 154,880
- Release Date
- 2026-02-24
- License
- MIT
Get Started
HuggingFace
How Much VRAM Does GLM 4.7 Flash Heretic 1.2.0 Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| Q2_K | 3.40 | 13.8 GB | 91.1 GB | 12.73 GB | 2-bit quantization with K-quant improvements |
| Q3_K_S | 3.50 | 14.2 GB | 91.5 GB | 13.10 GB | 3-bit small quantization |
| Q3_K_M | 3.90 | 15.7 GB | 93.0 GB | 14.60 GB | 3-bit medium quantization |
| Q4_0 | 4.00 | 16.1 GB | 93.3 GB | 14.97 GB | 4-bit legacy quantization |
| Q4_K_M | 4.80 | 19.1 GB | 96.3 GB | 17.97 GB | 4-bit medium quantization — most popular sweet spot |
| Q5_K_M | 5.70 | 22.4 GB | 99.7 GB | 21.33 GB | 5-bit medium quantization — good quality/size tradeoff |
| Q6_K | 6.60 | 25.8 GB | 103.1 GB | 24.70 GB | 6-bit quantization, very good quality |
| Q8_0 | 8.00 | 31.0 GB | 108.3 GB | 29.94 GB | 8-bit quantization, near-lossless |
Which GPUs Can Run GLM 4.7 Flash Heretic 1.2.0?
Q4_K_M · 19.1 GBGLM 4.7 Flash Heretic 1.2.0 (Q4_K_M) requires 19.1 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 25+ GB is recommended. Using the full 203K context window can add up to 77.3 GB, bringing total usage to 96.3 GB. 6 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti.
Runs great
— Plenty of headroom
Which Devices Can Run GLM 4.7 Flash Heretic 1.2.0?
Q4_K_M · 19.1 GB21 devices with unified memory can run GLM 4.7 Flash Heretic 1.2.0, including NVIDIA DGX H100, NVIDIA DGX A100 640GB, Mac Mini M4 Pro (24 GB).
Runs great
— Plenty of headroomRelated Models
Frequently Asked Questions
- How much VRAM does GLM 4.7 Flash Heretic 1.2.0 need?
GLM 4.7 Flash Heretic 1.2.0 requires 19.1 GB of VRAM at Q4_K_M, or 31.0 GB at Q8_0. Full 203K context adds up to 77.3 GB (96.3 GB total).
VRAM = Weights + KV Cache + Overhead
Weights = 29.9B × 4.8 bits ÷ 8 = 18 GB
KV Cache + Overhead ≈ 1.1 GB (at 2K context + ~0.3 GB framework)
KV Cache + Overhead ≈ 78.3 GB (at full 203K context)
VRAM usage by quantization
Q4_K_M19.1 GBQ4_K_M + full context96.3 GB- Can NVIDIA GeForce RTX 4090 run GLM 4.7 Flash Heretic 1.2.0?
Yes, at Q5_K_M (22.4 GB) or lower. Higher quantizations like Q6_K (25.8 GB) exceed the NVIDIA GeForce RTX 4090's 24 GB.
- What's the best quantization for GLM 4.7 Flash Heretic 1.2.0?
For GLM 4.7 Flash Heretic 1.2.0, Q4_K_M (19.1 GB) offers the best balance of quality and VRAM usage. Q5_K_S (21.7 GB) provides better quality if you have the VRAM. The smallest option is IQ2_XXS at 9.3 GB.
VRAM requirement by quantization
IQ2_XXS9.3 GBQ3_K_S14.2 GBQ4_117.9 GBQ4_K_M ★19.1 GBQ5_K_S21.7 GBQ8_031.0 GB★ Recommended — best balance of quality and VRAM usage.
- Can I run GLM 4.7 Flash Heretic 1.2.0 on a Mac?
GLM 4.7 Flash Heretic 1.2.0 requires at least 9.3 GB at IQ2_XXS, 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 GLM 4.7 Flash Heretic 1.2.0 locally?
Yes — GLM 4.7 Flash Heretic 1.2.0 can run locally on consumer hardware. At Q4_K_M quantization it needs 19.1 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is GLM 4.7 Flash Heretic 1.2.0?
At Q4_K_M, GLM 4.7 Flash Heretic 1.2.0 can reach ~153 tok/s on AMD Instinct MI300X. On NVIDIA GeForce RTX 4090: ~34 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 ÷ 19.1 × 0.55 = ~153 tok/s
Estimated speed at Q4_K_M (19.1 GB)
~153 tok/s~34 tok/s~114 tok/s~95 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of GLM 4.7 Flash Heretic 1.2.0?
At Q4_K_M, the download is about 17.97 GB. The full-precision Q8_0 version is 29.94 GB. The smallest option (IQ2_XXS) is 8.23 GB.
- Which GPUs can run GLM 4.7 Flash Heretic 1.2.0?
6 consumer GPUs can run GLM 4.7 Flash Heretic 1.2.0 at Q4_K_M (19.1 GB). Top options include NVIDIA GeForce RTX 5090, AMD Radeon RX 7900 XT, AMD Radeon RX 7900 XTX. 1 GPU have plenty of headroom for comfortable inference.
- Which devices can run GLM 4.7 Flash Heretic 1.2.0?
21 devices with unified memory can run GLM 4.7 Flash Heretic 1.2.0 at Q4_K_M (19.1 GB), including Mac Mini M4 (32 GB), Mac Mini M4 Pro (24 GB), Mac Mini M4 Pro (48 GB), Mac Pro M2 Ultra (192 GB). Apple Silicon Macs use unified memory shared between CPU and GPU, making them well-suited for local LLM inference.