Which PC for a local LLM in 2026? Complete guide
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Running a LLM (Large Language Model) locally has become accessible in 2026. Whether you’re a lawyer, doctor, accountant, or developer, a powerful enough PC can host a high-performance AI model on your own infrastructure — no cloud, no subscription, and your data never leaves your premises.
This guide precisely answers the question “Which PC for a local LLM?” with concrete recommendations, tested configurations, and a comparison of models based on your needs.
What determines the performance of a local LLM
Before choosing your setup, you need to understand the three critical parameters for running an LLM locally:
1. VRAM (graphics card video memory)
This is the number one limiting factor. An LLM is loaded into GPU memory for fast inference. The larger the model, the more VRAM is needed:
| Model size | Minimum VRAM | Recommended VRAM | Model examples |
|---|---|---|---|
| 7B parameters (Q4) | 4 GB | 8 GB | Mistral 7B, Llama 3.1 8B, Qwen2.5 7B |
| 13-14B parameters (Q4) | 8 GB | 12 GB | Llama 3.1 14B, Qwen3 14B, DeepSeek-R1 14B |
| 14-32B parameters (Q4) | 12 GB | 16 GB | Qwen3 32B, Llama 3.3 70B quantized |
| 70B parameters (Q4) | 40 GB | 48 GB+ | Llama 3.3 70B, Qwen2.5 72B |
| 70B+ (full precision) | 80 GB+ | Multi-GPU | Dedicated AI servers |
2. The CPU and system RAM
The CPU takes over when the model layers don’t fit in VRAM (offloading). The faster your system RAM, the more layers you can offload to the CPU without significantly slowing down speed. As a rule of thumb: at least 32 GB of DDR5 RAM for serious use, 64 GB for 30B+ models.
3. Storage
A 14B model in Q4 weighs about 8-9 GB. A 32B model weighs ~18 GB. Plan for a fast NVMe SSD (Gen 4 minimum) — initial loading time depends directly on it.
Which PC for local LLM? Our recommended configurations by use
🟢 Light use — Summaries, writing, Q&A on documents (7-14B models)
A lawyer who wants to summarize contracts, a doctor writing reports, an accountant searching for information in a document base: a 7B to 14B model in Q4_K_M is more than enough.
| Component | Minimum | Recommended |
|---|---|---|
| GPU | RTX 4060 8 GB | RTX 5060 8 GB GDDR7 |
| CPU | Ryzen 5 5600 | Ryzen 5 7500F / 9600X |
| System RAM | 16 GB DDR4 | 32 GB DDR5 |
| SSD | 500 GB NVMe Gen 3 | 1 TB NVMe Gen 4+ |
| Indicative budget | ~€900-1100 | ~€1200-1600 |
| Compatible models | Mistral 7B, Llama 3.1 8B, Qwen2.5 7B, Gemma 2 9B | |
| Inference speed | 30-60 tokens/s (comfortable for daily use) | |
🟡 Intermediate use — RAG, document analysis, coding (14-32B models)
For RAG (Retrieval Augmented Generation) on a corporate document base, detailed contract analysis, or development assistance, you need more power.
| Component | Recommended | Optimal |
|---|---|---|
| GPU | RTX 5060 Ti 16 GB GDDR7 | RTX 5070 12 GB GDDR7 |
| CPU | Ryzen 5 9600X | Ryzen 7 7800X3D / 9800X3D |
| System RAM | 32 GB DDR5 5600 MHz | 64 GB DDR5 |
| SSD | 1 TB NVMe Gen 4 | 2 TB NVMe Gen 5 |
| Indicative budget | ~€1600-2200 | ~€2200-3000 |
| Compatible models | Qwen3 14B/32B, DeepSeek-R1 14B, Llama 3.3 70B Q4 (partial) | |
| Inference speed | 20-50 tokens/s on 14B · 10-25 tokens/s on 32B | |
🔴 Intensive use — Multi-user AI server, fine-tuning (70B+ models)
A 10-person law firm, medical team, company wanting to deploy an internal AI assistant for all employees: a dedicated server configuration is required.
| Component | AI server configuration |
|---|---|
| GPU | RTX 5070 Ti 16 GB or RTX 5080 16 GB |
| CPU | Ryzen 7 9800X3D or Ryzen 9 9950X |
| System RAM | 64-128 GB DDR5 ECC |
| SSD | 2-4 TB NVMe Gen 5 |
| Indicative budget | €3000-6000+ |
| Compatible models | Llama 3.3 70B Q4, Qwen2.5 72B Q4, Mixtral 8x7B |
Which software to run an LLM locally?
Hardware is not enough — software is also needed to load and serve the models. The most used solutions in 2026:
Ollama — The simplest solution
Ollama is the go-to for getting started. One command is enough to download and run a model: ollama run qwen3:14b. It exposes an OpenAI-compatible REST API, usable from any application.
Open WebUI — The ChatGPT-like local interface
Open WebUI (formerly Ollama WebUI) offers an intuitive web interface similar to ChatGPT, deployable locally via Docker. Conversation management, system prompts, documents — everything is there.
LM Studio — For non-developers
LM Studio is the most accessible option for non-technical professionals. Graphical interface, one-click model downloads from Hugging Face, integrated local server.
llama.cpp — For maximum performance
llama.cpp is the most optimized inference engine. Used in backend by Ollama and LM Studio, it can be used directly to extract the latest performance from your hardware.
Which LLM models to recommend based on your profession?
| Profession / Use | Recommended model | VRAM required | Strengths |
|---|---|---|---|
| Lawyer — contract analysis | Qwen3 14B Q4_K_M | 10 GB | Legal reasoning, long context windows |
| Doctor — reports | Mistral Small 3.1 / Llama 3.1 8B | 6-8 Go | Smooth writing, fast inference |
| Accountant — financial analysis | Qwen2.5 14B Q4 / DeepSeek-R1 14B | 10-12 Go | Calculations, data structuring, spreadsheets |
| Developer — code assistance | Qwen2.5-Coder 14B / DeepSeek-Coder | 10 GB | Code completions, debugging, refactoring |
| General / versatile use | Qwen3 32B Q4_K_M | 18-20 Go | Best quality/size balance in 2026 |
| Multi-user server | Llama 3.3 70B Q4 | 40 GB+ | Maximum quality, concurrent use |
Local vs cloud LLM: why regulated professionals choose local
| Criterion | Cloud LLM (ChatGPT, Mistral AI…) | Local LLM (Radiance Systems) |
|---|---|---|
| Data confidentiality | ❌ Data sent to third-party servers | ✅ Data on your own machine |
| GDPR compliance | ⚠️ Depends on provider | ✅ Full compliance |
| Monthly cost | ❌ €20-100/month/user | ✅ Zero recurring cost |
| Availability | ⚠️ Depends on internet connection | ✅ Works offline |
| Model customization | ❌ Limited | ✅ Fine-tuning possible |
| Sensitive data (medical, legal…) | ❌ Real legal risk | ✅ Only compliant option |
Radiance Systems PCs for local LLM
Radiance Systems designs local AI workstations specially configured to run LLMs locally, delivered ready to use with Ollama and Open WebUI pre-installed on request.
- ✅ Configurations optimized for LLM inference (VRAM, RAM, storage)
- ✅ AM5 DDR5 platform for the best memory performance
- ✅ Latest generation NVIDIA RTX GPU (CUDA, optimized for llama.cpp)
- ✅ Windows 11 Pro or Linux according to your preference
- ✅ On-site installation available throughout the EU
- ✅ Dedicated technical support before and after purchase
- ✅ 2-year warranty — 50-day satisfaction or refund guarantee
Frequently Asked Questions — Local LLM
Can you run an LLM locally without a dedicated graphics card?
Yes, llama.cpp supports CPU inference. A 7B model in Q4 runs on any modern PC but at 3-8 tokens/s — too slow for daily use. A dedicated GPU is essential for a smooth experience (30+ tokens/s).
What is the difference between 8 GB and 16 GB of VRAM for an LLM?
With 8 GB, you can run models up to 13B in Q4 — sufficient for many uses. With 16 GB (like the RTX 5060 Ti 16 GB), you can access 32B models in Q4 that offer significantly higher quality, close to GPT-4.
Is a local LLM as powerful as ChatGPT?
In 2026, the best open-source models (Qwen3 32B, Llama 3.3 70B) compete with GPT-4o on most professional tasks. On a GPU with 16 GB of VRAM, you get GPT-4 level AI running entirely on your machine.
Is an internet connection required to use a local LLM?
No. Once the model is downloaded, it runs completely offline. This is one of the major advantages for sensitive environments or offices without a constant connection.
Which operating system for a local LLM?
Linux (Ubuntu) offers the best performance with llama.cpp and Ollama. Windows 11 works very well with LM Studio and Ollama for non-developers. Radiance Systems can deliver your workstation with the operating system of your choice.
How much does a local AI workstation cost compared to a cloud subscription?
A local AI workstation costs €1200 to €3000 depending on the configuration. A ChatGPT Pro subscription costs €20/month/user — that’s €240/year. For a 5-person office, the local AI workstation pays for itself in less than 24 months, with zero GDPR risk.
