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Open source DIY AI computing platform: Build a powerful RTX 3090 GPU rig under €1,300 for local LLM inference, training, and AI development. Complete with parts list, assembly guide, Ubuntu setup, and remote access configuration. Ideal for students, researchers, and hobbyists wanting affordable AI hardware without cloud dependencies.

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aicomputer

This is a guide on how you can build a low-cost (<1,300€) AI computer by yourself to run your AI flows locally.

Ideal for students on a low budget. The build can, of course, also be expanded and constructed in a way to offer the best performance for enterprises, for example.

Table of Contents

Parts List

Component Model
GPU RTX 3090 FE (used)
CPU Intel i5 12400F
Motherboard Asus PRIME B660M-K D4
RAM Corsair Vengeance LPX 32GB (2x16GB)
Storage WD Green SN3000 500GB NVMe
PSU MSI MAG A750GL PCIE5 750W
CPU Cooler ARCTIC Freezer 36
Case Fans 4x ARCTIC P12 PWM
Case ASUS Prime AP201 MicroATX

Note: Links are to German retailers but parts are available worldwide

Assembly Guide

  1. Unpack all components
  2. Install CPU on motherboard
  3. Mount CPU cooler
  4. Install RAM modules
  5. Install M.2 SSD
  6. Mount motherboard in case
  7. Connect front panel cables
  8. Install power supply
  9. Install exhaust fan:

    Exhaust fan installation

  10. Install GPU
  11. Close case

Installation

  1. Connect:
    • Ethernet cable to router
    • Keyboard to motherboard USB
    • Monitor to GPU (not motherboard)
  2. Download Ubuntu Server
  3. Create bootable USB
  4. Insert USB into motherboard port
  5. Power on (PSU switch to 'I')
  6. Enter BIOS/boot menu:

    Monitor

  7. Select USB boot device:

    Monitor-2

  8. Complete Ubuntu installation with SSH server enabled

Remote Access Setup

After installation, you can SSH from any device on your network:

ssh username@192.168.2.x  # Replace with your machine's IP

How to get the IP

  1. Connect the monitor along with the mouse and keyboard.

  2. Input the Wi-Fi password via the GUI and connect to Wi-Fi.

  3. Run ip a in the terminal and find the IP (it will look like 192.168.x.x or 10.0.x.x).

  4. From my end, run ssh username@thisip

Usage

Ready to use with GPU accelerated models from Ollama and other AI frameworks.

Need Help?

Reach out to me on X for build assistance or questions!

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Open source DIY AI computing platform: Build a powerful RTX 3090 GPU rig under €1,300 for local LLM inference, training, and AI development. Complete with parts list, assembly guide, Ubuntu setup, and remote access configuration. Ideal for students, researchers, and hobbyists wanting affordable AI hardware without cloud dependencies.

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