With a 500w PSU, you’ll have enough power to run your Mac and other desktop computers for a few hours.
But what about your laptop, tablet or netbook?
If you’re using an ATA12v or similar power supply (such as the Dell Precision XPS12 or Intel XPS 12), you’re going to need more power.
This article explains how to use both an ATXT12v and ATX 12v power source, as well as how to connect them together, to keep your laptop running efficiently.
For more information about the different power supply types, see our Power Supply Articles section.
What’s a PSU?
The most basic power supply is a single-phase, single-ended DC (DC-DC) converter.
An ATX (All-In-One) power supply consists of two DC rails, connected to one another via a power plug, which connects to the other power source.
A typical ATX power supply has three outputs: two 12v and two 230v rails.
If you want to connect two 12 or 230v power supplies, you will need two 12-pin connectors and two 15-pin connector.
To connect the two 12 volt rails, you can use an 11-pin ATX connector and the two 10-pin XPS connectors.
An older ATX PSU may have two 12volt rails, and the old ATX-12V power supply may have only one 12volt rail.
A new ATX is a 12v 12-volt power supply with two 10volt outputs and a 12-port header.
For details on how to build your own ATXpower supply, see Building an ATXPower Supply.
What about a PSU that has more than one 12-amp output?
If your ATXTpower supply has more voltage than 12 amps, you might want to consider a 120v PSU instead.
The 120v 12 volt power supply provides a maximum of 120 amps, which is enough power for most modern laptops, tablets and netbooks.
However, the 120v power output is not as good as the 120 volt 12v output, which can be used for laptops with up to 8 gigabytes of RAM or higher.
Some 120v models may only provide up to 60 amps.
There are also 120v-only ATXPS units that provide up, or even up to 120 amps.
An additional 120v ATX can be built into some ATX PSUs.
These units can only provide 30 amps, so they are not recommended for use in laptops or netbooks larger than 8 gigabyte.
If your power supply only provides up to 30 amps and you want more, you should consider buying a 120-volt ATXps unit instead.
What is the difference between a 120 and 120v PSU?
A 120v unit uses 12-pins, while a 120volt PSU has three 12-Pin connectors.
Both units use a 12VDC power supply.
A 120 volt PSU can provide 120 watts of power, while 120v units can provide up and up to 90 watts.
If both units supply up to 180 watts, you need a 120V PSU.
A PSU can have multiple 120 volt outputs, so you will get three 120v outputs if you have more than three 120 volt units.
You can also connect more than four 120 volt power supplies.
You should check your PSU specifications to find out what the maximum voltage your PSU can supply.
You may also want to check the specifications of your PSU, to ensure that it meets your needs.