Power Supply - Desktop PSU

Every electronic device has a PSU that converts AC voltages from the mains supply to different DC voltage levels required by the components and systems. It is not a different story for computers, servers, workstations, and any other IT equipment in your server. Most of the computer power supplies we see today use switched-mode operation and conforms to the ATX standards.

How to Choose a Desktop Power Supply

Different manufacturers have varying designs for their products. That has led to the differences in the desktop power supplies in the market today. Some of the parameters are efficiency, form factor, protection, input and output power rating, and many others. When searching for a new desktop power supply, you have to factor in these parameters:

Desktop Power Supply Efficiency

You need a desktop power supply with the highest efficiency, there is no doubt about that. The efficiency of these power devices is defined as the ratio of output to input power. An efficient PSU produces less heat, making the cooling of the system easy. A less efficient product, on the other hand, leads to wastage of electrical power.


You don't want your newly acquired product to smoke just a few months after buying it. The system also needs protection from voltage and current spikes, and overload. Ensure your new product is safe for use, even when there are power surges.

Power Rating

The total output power from a PSU matters a lot, and it depends on the intended use. Different PSUs in the market have varied ratings. For that reason, you have to be very careful not to buy inappropriate PSU. For example, an HP switching power supply for DC7100 is rated 340W while a 3YKG5 Dell power supply for Dell Optiplex is rated 240W. This shows that you need to define the targeted use of the power supply before making the purchase. Also, check the rated input and output parameters and your power system frequency.

Power Supply Form Factor

You have many options when it comes to the chassis size of the Desktop Power Supply unit. Firstly, you need what will easily fit in your existing case. Secondly, you need to check whether it is modular or not. Most of the power supplies you will find use ATX standards to define the physical size. There are desktop power supplies with small form factors such as SFX and CFX. For example, 468929-003 HP is an SFF power supply unit.

Power Supply Connectors

If the connectors in your desktop power supply cannot match the component pins on the computer, then that PSU is not useful. You have to match the power connectors on the PSU to the pins on the motherboard.

Power Factor Correction

Some power supply units, such as Lenovo 240W, have a power factor correction mechanism. This is to avoid back-feeding harmonics to the power system and comply with the laws in some regions. A power supply with PFC mechanisms is also more efficient than those without. If the power factor is your main concern, then you can check out this feature.

Buy an efficient desktop power supply at ALLHDD for your systems. All our products are tested and approved.

Dell 03N200 160 Watt Desktop Power Supply

03N200 Dell 160 Watt Power Supply Optiplex. Refurbished.

Lenovo 0A37783 240 Watt Desktop Power Supply

0A37783 Lenovo 240 Watt With Pfc Power Supply For Thinkcentre M57e. Refurbished.

IBM 23K7988 130 Watt Desktop Power Supply

23K7988 IBM 130 Watt Power Supply For Surepos 4800 Series. Refurbished.

Dell 2TXYM 240 Watt Desktop Power Supply
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2TXYM Dell 240 Watt SFF Power Supply For Optiplex 390 790 990. New Bulk Pack.

Dell 2TXYM 240 Watt Desktop Power Supply

2TXYM Dell 240 Watt SFF Power Supply For Optiplex 390 790 990. Refurbished.

Cisco 34-1617-02 47 Watt  Power Supply Desktop Power Supply

34-1617-02 47 Watt Desktop Power Supply | Made by Cisco | Refurbished

Dell 3YKG5 240 Watt  Desktop Power Supply

3YKG5 Dell 240 Watt Power Supply For Dell Optiplex 7010/9010/990/790 Sff. Refurbished.

HP 405349-001 575-Watts Power Supply

405349-001 575-Watts Power Supply Unit (PSU) for XW6400/ XW8400 Series Work Stations | Made by HP | Refurbished

HP 412848-001 575-Watts PSU

412848-001 575-Watts Power Supply Unit (PSU) for XW6400 and XW8400 Series Work Stations Servers | Made by HP | Refurbished

IBM 41L5215 Desktop Power Supply

41L5215 390-Watts Power Supply Unit (PSU) for Desktop | Made by HPE | Refurbished

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