You do not need an open-air mining frame to run two GPUs. A roomy ATX mid-tower with good airflow can host a dual-GPU build that lives quietly in a home office. Here is how to put it together without compromising thermals or your ears.
1. Pick the right case
Look for a case with at least seven expansion slots, mesh front intake, and at least 165mm of CPU cooler clearance. Cases with vertical GPU mounts can help, but a clean horizontal layout with a riser is often more reliable.
2. Choose a motherboard with two real x16 slots
The second slot does not need to run at electrical x16, but it should be a physical x16 slot wired to at least x4 PCIe lanes. Spacing between the two slots matters: aim for at least three slots of vertical separation so the top GPU has room to breathe.
3. Use a quality PCIe riser
For a two-GPU build, a shielded PCIe Gen3 ribbon riser is the right tool. Avoid the powered USB risers you see in open-air ETH-era builds — they are a different category and a poor fit for an enclosed case.
4. Plan the power cables
- Use a single 850W to 1000W PSU rather than two smaller units
- Give each GPU two separate PCIe cables, not one daisy-chained cable
- Route cables behind the motherboard tray to keep airflow clean
5. Set up airflow before you power on
Three intake fans at the front, one exhaust at the rear, one exhaust at the top. Positive pressure helps keep dust out. Set fan curves to be slow and steady — high RPM spikes are louder than a constant low hum.
6. First boot checks
- Confirm both GPUs are detected in BIOS
- Confirm both run at expected PCIe link width
- Stress test for 30 minutes and watch temperatures
- Power-limit each GPU to its efficient sweet spot, usually 70 to 80 percent
7. Live with it
Re-paste the CPU annually, blow out dust monthly with the rig powered off, and keep the case 10cm clear of walls on all sides. A well-built dual-GPU PC will run for years.