One of the friendliest things about mining Malairte is that you do not need an industrial 220V power supply or a stack of server PSUs wired in parallel. A normal household ATX power supply, the kind you would buy for any decent gaming PC, is enough for the great majority of home mining setups.
Estimating real draw
Start from sustained load rather than marketing peak. A single GPU pulling 150W to 220W under mining, plus a Ryzen or Intel CPU drawing 65W to 125W, plus motherboard, RAM, and a couple of fans, lands most single-GPU PCs in the 250W to 400W sustained range at the wall.
Sensible headroom
You want the PSU to spend most of its life in its sweet spot, which for modern units is roughly 40 to 70 percent of rated capacity. That gives you cool running, quieter fans, and longer life. For a single mid-range GPU build, a quality 650W to 750W unit is the comfortable answer.
Two-GPU rigs
For two GPUs in a normal ATX case, plan for 850W to 1000W. Make sure the PSU has enough native PCIe power connectors, not a tangle of daisy chains. Two separate cables to each card is the right move.
Efficiency tiers
- 80 Plus Bronze: acceptable for a budget single-GPU rig
- 80 Plus Gold: the sweet spot for value and efficiency
- 80 Plus Platinum/Titanium: worth it if your power costs are high and the rig runs 24/7
Single rail vs multi-rail
For a home mining PC, a quality single-rail unit is simpler. It avoids the trip-on-spike behaviour some multi-rail units exhibit when a GPU briefly draws hard.
What to avoid
Skip no-name "1200W" PSUs from marketplaces. They lie about output, deliver dirty power, and can take a GPU with them when they fail. The PSU is not the place to save thirty dollars.