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.

IBM 41L5215 Desktop Power Supply

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

3% Discount on Checkout
HP 436953-001 Power Supply

436953-001 HP 365-Watts ATX 24-Pin Power Supply Unit (PSU) PFC DC7700 MicroTower Desktop System for Server | Made by HP | Refurbished

3% Discount on Checkout
IBM 44T0833 500 Watt Desktop Power Supply

44T0833 IBM 500 Watt Power Supply For IBM Flashsystem 710/810. Refurbished.

3% Discount on Checkout
HP 480794-002 Power Supply

480794-002 1110-Watts Power Supply Unit (PSU) Z800 Work Station for Servers | Made by HP | Refurbished

3% Discount on Checkout
503378-001 HP 320 Watt Power Supply

503378-001 320-Watt Power Supply Unit (PSU) 6005MT Elite 8000 MT for Servers | Made by HP | Refurbished

3% Discount on Checkout
HP 508148-001 850W Power Supply

508148-001 850 Watt Power Supply for Workstation Z800 | Made by HP | Refurbished

3% Discount on Checkout
HP 508149-001 Desktop Power Supply

508149-001 1110-Watt Power Supply for Workstation Z800 | Made by HP | Refurbished

3% Discount on Checkout
HP 508153-001 320 Watt Desktop Power Supply

508153-001 HP 320 Watt Power Supply For 6005MT Elite 8000 Microtower Pcs | Refurbished

3% Discount on Checkout
HP 508548-001 650 Watt  Desktop Power Supply

508548-001 HP 650 Watt Power Supply For Workstation Z600 | Refurbished

3% Discount on Checkout
Lenovo 54Y8859 280 Watt  Desktop Power Supply

54Y8859 Lenovo 280 Watt Power Supply For Thinkcentre M82 | Refurbished

3% Discount on Checkout
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