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 G4265 350 Watt Desktop Power Supply

G4265 Dell 350 Watt Power Supply For Desktop | Refurbished

Dell H235P-00 Desktop Power Supply

H235P-00 Dell 235-Watt Power Supply Unit (PSU) 100-240V Optiplex 760 960 Small Form Factor (SFF) 50-60Hz | Made by Dell | Refurbished

HP H825EF-00  Desktop Power Supply Power Supply

H825EF-00 HP 825 Watt Hot Plug Power Supply For Precision T5600 | Refurbished

Dell H875E-00 875 Watt  Desktop Power Supply

H875E-00 Dell 875 Watt Power Supply For Precision Workstation T5400. Refurbished.

HP 613765-001 Power Supply 320 Watt

613765-001 Power Supply 320 Watt 12vdc Four Outputs for 8200 Elite | Made by HP | Refurbished

HP 632914-001 1125 Watt Desktop Power Supply

632914-001 1125 Watt Power Supply for Workstation Z820 | Made by HP | Refurbished

HP 675450-B21 350W Power Supply

675450-B21 350W Alternating Current (AC) Factory Integrated G8 Power Supply | Made by HP | Refurbished

HP 686679-001 350W Power Supply

686679-001 350W Alternating Current (AC) Factory Integrated G8 Power Supply | Made by HP | Refurbished

HP 702307-001 Power Supply 240 Watt

702307-001 Power Supply 240 Watt for 600 Powered Devices PD Small Form Factor SFF 800ED Z230T Promo Z230T | Made by HP | Refurbished

HP 702307-002 Power Supply 240 Watt

702307-002 Power Supply 240 Watt for 600 Powered Devices PD Small Form Factor SFF 800ED Z230T Promo Z230T | Made by HP | Refurbished

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