How to build a mining rig inside a PC case?

Building a mining rig in a PC case requires compatible GPUs, a robust PSU, proper riser cables, and effective cooling for stable 24/7 operation.

Aug 06, 2025 at 11:01 pm

Understanding the Basics of a Mining Rig in a PC Case

Building a mining rig inside a PC case involves transforming a standard computer chassis into a dedicated system for cryptocurrency mining. Unlike traditional desktop builds focused on gaming or productivity, a mining rig prioritizes GPU efficiency, power delivery, and thermal management. The core components include a motherboard with multiple PCIe slots, compatible graphics processing units (GPUs), a robust power supply unit (PSU), and a reliable CPU and RAM setup to support the mining software. Selecting a full-tower or mid-tower ATX case is essential to accommodate multiple GPUs and ensure adequate airflow.

The motherboard must support at least as many GPUs as you plan to install, typically requiring PCIe x16 slots. Many miners use specialized motherboards like the ASUS B250 Mining Expert or ASRock H110 Pro BTC+, which offer up to 13 PCIe slots. These boards are designed to handle multiple GPUs simultaneously. Standard consumer motherboards may not support more than 4–5 GPUs without BIOS modifications or riser cards.

Selecting Compatible Hardware Components

Choosing compatible hardware is crucial to avoid bottlenecks or system instability. The GPU is the most important component since it performs the hash calculations required for mining. Popular choices include NVIDIA GeForce RTX 3060 Ti, RTX 3070, or AMD Radeon RX 6700 XT, known for their hashrate-to-power consumption ratio. Ensure all GPUs are from the same manufacturer and model for consistent driver support and performance.

The PSU must deliver stable power to all components. A minimum of 1000W 80+ Gold certified PSU is recommended for a 6-GPU setup, with modular cables for better cable management. Use PCIe 8-pin or 6+2 pin connectors to power the GPUs. For larger builds, consider using dual PSUs with a Y-cable or PSU combiner board to distribute load safely.

The CPU and RAM do not need to be high-end. A basic Intel Celeron or AMD Ryzen 3 processor is sufficient. Pair it with 4GB to 8GB of DDR4 RAM. The operating system (typically Linux or HiveOS) and mining software require minimal processing power, allowing you to save on these components.

Installing PCIe Riser Cables and GPUs

To fit multiple GPUs inside a standard PC case, PCIe riser cables are used to extend the connection between the motherboard and the graphics cards. These are USB 3.0 to PCIe x1 adapters that allow vertical or horizontal GPU mounting. Purchase powered risers (with a 6-pin PCIe power connector) to prevent signal degradation and ensure stable operation.

• Connect the riser cable to an available PCIe x1 slot on the motherboard.
• Plug the 6-pin power connector from the PSU into the riser to provide auxiliary power.
• Attach the GPU to the riser’s PCIe x16 end.
• Secure each GPU with standoffs or brackets to prevent sagging.
• Maintain space between GPUs for airflow—use spacers if necessary.

Ensure all risers are of the same revision (e.g., v009) to avoid compatibility issues. Test each GPU individually before full assembly to confirm detection and stability.

Configuring Power Delivery and Cabling

Efficient power distribution is critical when running multiple GPUs. Use a PSU with multiple 6+2 pin PCIe outputs, or employ PCIe splitters (1-to-2 or 1-to-4) cautiously—only if the total draw per cable does not exceed 150 watts. Overloading a single PCIe cable can cause overheating or fire hazards.

Route power cables underneath the motherboard tray or along the case’s rear channels to reduce clutter. Use zip ties or Velcro straps to bundle cables neatly. Connect each GPU’s power input directly from the PSU when possible. If using dual PSUs, synchronize their startup with a PSU killer switch or Y-adapter that triggers both units simultaneously.

For data connections, link each riser directly to the motherboard. Avoid daisy-chaining risers. Use SATA power to PCIe adapters only if absolutely necessary and verify their wattage limits. Label each cable for easier troubleshooting.

Setting Up the Operating System and Mining Software

Install a lightweight mining OS such as HiveOS, RaveOS, or SimpleMiner on a USB flash drive. These systems are optimized for GPU mining, offering remote management, monitoring, and automatic driver installation. Boot the system from the USB drive and configure network settings to gain internet access.

Once online, access the mining OS dashboard via a web browser using the rig’s IP address. Add your wallet address, mining pool URL, and worker name in the configuration panel. Select the appropriate mining algorithm based on your GPU model—for example, Ethash for Ethereum Classic or KawPoW for Ravencoin.

The OS will automatically detect all GPUs. Monitor temperatures and fan speeds through the dashboard. Adjust GPU core clock, memory clock, and voltage using the tuning tools to optimize hashrate and power efficiency. Save the profile once stable performance is achieved.

Thermal Management and Ventilation Setup

Mining generates substantial heat, so effective cooling is mandatory. Install at least two 120mm intake fans at the front and two exhaust fans at the rear or top of the case. For full-tower cases, consider adding a bottom fan to cool the PSU and risers.

Position GPUs with their fans facing inward if using blower-style cards, or outward for open-air coolers. Use thermal pads or additional fans on VRAM and power delivery modules if temperatures exceed 90°C. Keep ambient room temperature below 25°C and avoid carpeted or enclosed spaces.

Monitor thermal performance through the mining OS. Set automatic shutdown rules if GPU temperature exceeds 85°C. Clean dust from filters and heatsinks weekly to maintain airflow.

Frequently Asked Questions

Can I use a standard ATX case for a 6-GPU mining rig?

Yes, a full-tower ATX case can fit 6 GPUs using riser cables and proper spacing. Ensure the case has enough drive bays or expansion slots to mount GPUs vertically or horizontally without obstruction.

Do all GPUs need direct power from the PSU?

Yes, each GPU should receive power directly from the PSU via its own 6+2 pin connector. Sharing power cables between GPUs is unsafe and may overload the circuit.

Why are my GPUs not being detected?

This may result from faulty riser cables, insufficient power to the riser, incorrect BIOS settings (e.g., PCIe x1 link speed), or outdated motherboard firmware. Test each component individually and ensure the BIOS is set to Above 4G Decoding and Resizable BAR if supported.

Is it safe to run a mining rig 24/7 inside a home environment?

Yes, provided the rig is in a well-ventilated area, away from flammable materials, and uses a high-efficiency PSU with over-voltage and over-temperature protection. Regular monitoring reduces risks.