GPT X2 125M CIx Long Context — Hardware Requirements & GPU Compatibility
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GPT X2 125M CIx Long Context is a 126M-parameter open language model from reaperdoesntknow. It supports a context window of up to 32,768 tokens. At BF16 it needs about 0.60 GB of VRAM — see which GPUs and Macs can run it below.
490 downloads
2 likesSpecifications
- Publisher
- reaperdoesntknow
- Parameters
- 126M
- Architecture
- GPTX2ForCausalLM
- Context Length
- 32,768 tokens
- Vocabulary Size
- 32,768
- Release Date
- 2026-06-06
- License
- Apache 2.0
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How Much VRAM Does GPT X2 125M CIx Long Context Need?
Select a quantization to see compatible GPUs below.
| Quantization | Bits | VRAM | + Context | File Size | Quality |
|---|---|---|---|---|---|
| BF16 | 16.00 | 0.6 GB | 1.3 GB | 0.25 GB | Brain floating point 16 — preferred for training |
Which GPUs Can Run GPT X2 125M CIx Long Context?
BF16 · 0.6 GBGPT X2 125M CIx Long Context (BF16) requires 0.6 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 1+ GB is recommended. Using the full 33K context window can add up to 0.7 GB, bringing total usage to 1.3 GB. 35 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti.
Runs great
— Plenty of headroomWhich Devices Can Run GPT X2 125M CIx Long Context?
BF16 · 0.6 GB33 devices with unified memory can run GPT X2 125M CIx Long Context, including NVIDIA DGX H100, NVIDIA DGX A100 640GB.
Runs great
— Plenty of headroomRelated Models
Frequently Asked Questions
- How much VRAM does GPT X2 125M CIx Long Context need?
GPT X2 125M CIx Long Context requires 0.6 GB of VRAM at BF16. Full 33K context adds up to 0.7 GB (1.3 GB total).
VRAM = Weights + KV Cache + Overhead
Weights = 126M × 16 bits ÷ 8 = 0.3 GB
KV Cache + Overhead ≈ 0.3 GB (at 2K context + ~0.3 GB framework)
KV Cache + Overhead ≈ 1 GB (at full 33K context)
VRAM usage by quantization
BF160.6 GBBF16 + full context1.3 GB- Can I run GPT X2 125M CIx Long Context on a Mac?
GPT X2 125M CIx Long Context requires at least 0.6 GB at BF16, 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 GPT X2 125M CIx Long Context locally?
Yes — GPT X2 125M CIx Long Context can run locally on consumer hardware. At BF16 quantization it needs 0.6 GB of VRAM. Popular tools include Ollama, LM Studio, and llama.cpp.
- How fast is GPT X2 125M CIx Long Context?
At BF16, GPT X2 125M CIx Long Context can reach ~4858 tok/s on AMD Instinct MI300X. On NVIDIA GeForce RTX 4090: ~1092 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 ÷ 0.6 × 0.55 = ~4858 tok/s
Estimated speed at BF16 (0.6 GB)
~4858 tok/s~1092 tok/s~3631 tok/s~3004 tok/sReal-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
- What's the download size of GPT X2 125M CIx Long Context?
At BF16, the download is about 0.25 GB.
- Which GPUs can run GPT X2 125M CIx Long Context?
35 consumer GPUs can run GPT X2 125M CIx Long Context at BF16 (0.6 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 GPT X2 125M CIx Long Context?
33 devices with unified memory can run GPT X2 125M CIx Long Context at BF16 (0.6 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.