A dual PSU adapter is often used on GPU mining rigs when getting enough power to the mining rig can’t be achieved with a single power supply. Lately, a new reason has surfaced that makes using a dual PSU adapter a necessity even for small builds: The lack of high-powered PSUs available for purchase creates the need to combine two smaller units.
Using 2 GPUs to power a mining rig
Let’s use a real-word example. Let’s say we’re building a mining rig, and we’ve computed that it will draw 1250 watts when mining. Considering the 80% capacity what we actually need a PSU that pushes 1,563 watts or higher. If we can’t get our hands on a a 1600W PSU, we’d have to go with a combination of sizes that will get us to right about 1,600 watts.
Our Dual-PSU 1700 watt shopping list
* You can connect any two ATX power supplies to attain the power necessary for your mining rig. We always recommend purchasing platinum-rated power supplies as they are built to endure the 24/7/365 running requirement.
Why do you need a dual-PSU adapater?
When a computer, which is what a mining rig is, powers up, it sends a signal to the power supply alerting it that it’s going to need power. The power supply spins up and begins supplying power based on the demand. That signal is sent from the motherboard via the 24-pin cable. But, when using two power supplies, only one of them is going to be connected to the motherboard, so only one PSU is going to get the signal to wake up.
That’s where the dual PSU adapter comes in.
What this adapter is doing is replicating that signal that the motherboard sends and notifying the second power supply that it also needs to start doing it’s job.
Connecting the two PSUs
Let’s consider this setup: we’ll use one PSU to power 1/2 the video cards as well as the motherboard. We’ll call that one PSU #1. PSU #2 is going to power the remaining video cards. Here’s how to connect them. Beyond the dual-PSU adapter we’ll also be using the 24-pin ATX power cable from one of the power supplies.
- Plug the end of the Dual PSU Adapter 24-pin cable that only has two wires going to it to PSU #2’s 24-pin port.
- Connect the 24-pin motherboard cable that came with PSU #1 into PSU #1.
- Look at the two ends of the Dual PSU Adapter and identify the end which is intended to connect to the motherboard.
- Hint: it will have a locking mechanism that looks similar to the currently unused end of the 24-pin cable.
- Connect the 24-pin connector identified in step 2 to the motherboard.
- Plug the remaining end of the adapter to the remaining end of the 24-pin power cable connected to PSU #1.