JiRackUltra 14B — Hardware Requirements & GPU Compatibility
ChatFunctions
JiRackUltra 14B is a 14.8B-parameter open language model from CMSManhattan. It supports a context window of up to 131,072 tokens. At Q4_K_M it needs about 9.56 GB of VRAM — see which GPUs and Macs can run it below.
Runs great on a 24 GB GPU
Runs from 8 GB (IQ2_XS · 16K)Best on 24 GB (Q4_K_M · ~69 tok/s · 64K)Macs from 16 GB (Q4_K_M · ~15 tok/s)
MIT
Reference GPU · RTX 4090 24 GB
Estimates, ±20% · how we estimate
Run JiRackUltra 14B
One recommended way. Every other method, OS and quant is in the step-by-step guide.Each way opens a step-by-step guide for your OS and quant.
Recommended
ollama run hf.co/mradermacher/JiRackUltra_14b-i1-GGUF:Q4_K_MQ4_K_M fits fully on the RTX 4090 · 11.6 GB free · 16K context
Download: JiRackUltra_14b.i1-Q4_K_M.gguf8.99 GBmradermacher
Ways to runOther ways
each opens step-by-stepRun in cloud
Your own private copy · Q4_K_M · 24 GB GPU
- The easiest way to try this model
- Running in a few minutes, easy setup
- Chat right here or connect any app
$5+ bonus for new users
Runs on RTX 3090 (24 GB) (11 GB headroom) · Q4_K_M
- Generation speed
- ~64 tok/s
- generation speed
- Cost per 1M output tokens
- $0.74
- per 1M output tokens
How Much VRAM Does JiRackUltra 14B Need?
Select a quantization level; the listed hardware adheres to it.
| Quantization | VRAM | +32K | On RTX 4090 (reference) | |
|---|---|---|---|---|
| 7.0 GB | 13 GB | 2-bit · K-quant — 2-bit quantization with K-quant improvements | Fits: 64K context · ~94 tok/s | |
| 7.2 GB | 13.2 GB | 3-bit small — 3-bit small quantization | Fits: 64K context · ~92 tok/s | |
| 7.9 GB | 13.9 GB | 3-bit medium — 3-bit medium quantization | Fits: 64K context · ~83 tok/s | |
| 8.1 GB | 14.1 GB | 4-bit · legacy — 4-bit legacy quantization | Fits: 64K context · ~81 tok/s | |
| 9.6 GB | 15.6 GB | 4-bit medium — 4-bit medium quantization — most popular sweet spot | Fits: 64K context · ~69 tok/s | |
| 11.2 GB | 17.3 GB | 5-bit medium — 5-bit medium quantization — good quality/size tradeoff | Fits: 64K context · ~58 tok/s | |
| 12.9 GB | 18.9 GB | 6-bit, very good — 6-bit quantization, very good quality | Fits: 32K context · ~51 tok/s | |
| 15.5 GB | 21.5 GB | 8-bit, near-lossless — 8-bit quantization, near-lossless | Fits: 32K context · ~42 tok/s |
Selected Q4_K_M
4-bit medium quantization12.4GBat 16K context
- Weights
- 8.9 GB
- KV cache
- 3.2 GB
- Overhead
- 0.3 GB
Fits RTX 4090 (reference) · 11.6 GB free · ~69 tok/s
≥50 tok/s needs ≥735 GB/s · RTX 5090 ~122, RTX 3090 Ti ~69
Which Hardware Can Run JiRackUltra 14B?
Q4_K_M · 9.6 GBJiRackUltra 14B (Q4_K_M) requires 9.6 GB of VRAM to load the model weights. For comfortable inference with headroom for KV cache and system overhead, 13+ GB is recommended. Using the full 131K context window can add up to 25.4 GB, bringing total usage to 34.9 GB. 40 GPUs can run it, including NVIDIA GeForce RTX 5090, NVIDIA GeForce RTX 3090 Ti, NVIDIA GeForce RTX 3080 Ti. 150 devices with unified memory can run JiRackUltra 14B, including Mac Studio (M3 Ultra, 256GB), Mac Studio (M3 Ultra, 512GB), Mac Mini M2 Pro (16 GB).
16–18 GB
16–18 GB tier →fits · 3.6 GB free · up to 32K ctx
18 GPUs · 2 Mac classes · 2 device families
RTX 5080~65Simulate output on RTX 5080RTX 5070 Ti~61Simulate output on RTX 5070 TiRTX 4080 SUPER~50Simulate output on RTX 4080 SUPERM516 GB~11Simulate output on MacBook Air 13" M5 (16 GB)M3 Pro*18 GB~11Simulate output on MacBook Pro 14" M3 Pro (18 GB)iPad~11Simulate output on iPad Pro M5 13" (16 GB)Orin NX~7Simulate output on NVIDIA Jetson Orin NX 16GB20 GB
fits · 7.6 GB free · up to 32K ctx
1 GPU
RX 7900 XT~50Simulate output on RX 7900 XT32–40 GB
fits · 19.6 GB free · up to 64K ctx
1 GPU · 3 Mac classes · 4 device families
RTX 5090~122Simulate output on RTX 5090M5 Max36 GB~34Simulate output on Mac Studio M5 Max (36 GB)M532 GB~11Simulate output on MacBook Air 13" M5 (32 GB)Orin~14Simulate output on NVIDIA Jetson AGX Orin 32GBSnapdragon X Elite (X1E-80-100)~9Simulate output on Snapdragon X Elite Copilot+ PC
By VRAM tier · typical GPUs and Macs at Q4_K_M
Similar models
6| Model | Score | VRAM | tok/s | Why it is similar |
|---|---|---|---|---|
| Phi 4 ReasoningMicrosoft | — | 12.5 GB | ~69 | same size |
| Phi 3 Medium 128k InstructMicrosoft | — | 12 GB | ~72 | same size |
| Qwen1.5 14BAlibaba | — | 22.2 GB | ~63 | same size |
| Nemotron Terminal 14BNVIDIA | — | 11.9 GB | ~69 | same size |
| Ministral 3 14B Reasoning 2512Mistral AI | — | 12 GB | ~72 | same size |
| Qwen3 14B BaseAlibaba | — | 11.9 GB | ~69 | same size |
Specifications
- Publisher
- CMSManhattan
- Parameters
- 14.8B
- Architecture
- Qwen2ForCausalLM
- Context Length
- 131,072 tokens
- Vocabulary Size
- 152,064
- Release Date
- 2026-08-03
- License
- MIT
Frequently Asked Questions
How much VRAM does JiRackUltra 14B need?
JiRackUltra 14B requires 9.6 GB of VRAM at Q4_K_M, or 30.2 GB at BF16. Full 131K context adds up to 25.4 GB (34.9 GB total).
VRAM = Weights + KV Cache + Overhead
Weights = 14.8B × 4.8 bits ÷ 8 = 8.9 GB
KV Cache + Overhead ≈ 0.7 GB (at 2K context + ~0.3 GB framework)
Fit ratings and hardware model lists check this model with room for a 16K-token context, which needs a little more memory.
KV Cache + Overhead ≈ 26 GB (at full 131K context)
VRAM usage by quantization
Can NVIDIA GeForce RTX 4090 run JiRackUltra 14B?
Yes, at Q8_0 (15.5 GB) or lower. Higher quantizations like BF16 (30.2 GB) exceed the NVIDIA GeForce RTX 4090's 24 GB.
What's the best quantization for JiRackUltra 14B?
For JiRackUltra 14B, Q4_K_M (9.6 GB) offers the best balance of quality and VRAM usage. Q5_K_S (10.9 GB) provides better quality if you have the VRAM. The smallest option is IQ2_XXS at 4.8 GB.
VRAM requirement by quantization
★ Recommended — best balance of quality and VRAM usage.
Can I run JiRackUltra 14B on a Mac?
Yes — Mac Mini M2 Pro (16 GB) and 133 other Macs can run JiRackUltra 14B. Apple Silicon uses unified memory, so the model shares RAM with the system. At Q4_K_M you need at least 9.6 GB of usable unified memory (RAM minus macOS overhead).
Can I run JiRackUltra 14B locally?
Yes — JiRackUltra 14B can run locally on consumer hardware. Popular tools include Ollama, LM Studio, and llama.cpp.
How fast is JiRackUltra 14B?
At Q4_K_M, JiRackUltra 14B can reach ~502 tok/s on AMD Instinct MI350X. On NVIDIA GeForce RTX 4090: ~69 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 ÷ 9.56 × 0.65 = ~544 tok/s
Estimated speed at Q4_K_M (9.6 GB)
Real-world results typically within ±20%. Speed depends on batch size, quantization kernel, and software stack.
What's the download size of JiRackUltra 14B?
At Q4_K_M, the download is about 8.86 GB. The full-precision BF16 version is 29.54 GB. The smallest option (IQ2_XXS) is 4.06 GB.
Which GPUs can run JiRackUltra 14B?
40 consumer GPUs can run JiRackUltra 14B at Q4_K_M. Top options include AMD Radeon RX 6800, AMD Radeon RX 6800 XT, AMD Radeon RX 6900 XT, AMD Radeon RX 6700 XT. 26 GPUs have plenty of headroom for comfortable inference.
Which devices can run JiRackUltra 14B?
150 devices with unified memory can run JiRackUltra 14B at Q4_K_M (9.6 GB), including AMD Ryzen AI 9 HX 370 (Strix Point) Laptop, ASUS Ascent GX10, Beelink GTR9 Pro (Ryzen AI Max+ 395, 128 GB), Framework Desktop (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.