Power supply selection guide

This MOD can make a post-IT.

Here is a general guide on how to select a power supply for your HP desktop computer.  The majority of the standard ATX power supply (PSU) must fit in an envelope of HP.  The exception would be a slim casing or the esoteric Merle.

Looking for a certification 80 + on the PSU to save electricity.  A PC is normally idle or operate at low load 75% of the time.  Therefore, to find a power supply which is more effective in the range 50 - 90W.  A power supply 80 + 350W reaches the level of efficiency of 80% at the exit of 70W (20% of rated output).  The output must be greater than 140W to achieve the same level of efficiency of a PSU of 700W 80 + equivalent.  So choose a power supply that is rated at 25% more than the maximum load of the ACTUAL spending of the rig you will save more of $ on electricity.

A modern PSU is designed to achieve maximum efficiency between 20 and 80% of the nominal power.  Running a power supply above 80% charge level will result in excessive heat, noise and premature failure.

A platform Nvidia GeForce GTX 280 (1024 MB of RAM) will rely on 350W max to the wall.  Taking into account the effectiveness of a block of power SUPPLY 80 +, the actual load on the power supply is only 280W (350 x 0.80).  To calculate the required power supply, multiply the actual load by 1.25 (25% margin).  In this case we only need a PSU 350W (280 x 1.25) to run this GPU.

Let's apply what we know of a rigging of Radeon HD 4870 (512 MB RAM).  290W max to the wall.  Actual load is 290W x 0.80 or 230W.  Now, apply the 25% margin rule and we come to a requirement of 290W PSU (230W x 1.25).  Even if we apply a safety margin of 50%, the power required is always under 350W (230W x 1.50).

There are no overspec need the power supply by 50%, unless you run your PC up 24/7.  Don't forget that there is a huge variation in the quality of the PSU and side.  Maybe a good 500W PSU is not able to provide as much energy as a quality 350W.  Antec Earthwatts/NeoPower/TruePower and Corsair Seasonic are widely available at several American retailers of quality units.

High-end power supplies number will need additional power supply PSU in the form of one or two 6/8 pin plug GPU.  You can buy an adapter to convert a molex 4pin to plug 6-pin power of GPUS.

http://www.TomsHardware.com/reviews/GeForce-Radeon-power, 2122 - 3.html

Hi Nautsj,

You need to open your PC and measure the physical dimensions of your diet. Here is a list of the things to consider:

1. technical characteristics
2. the total power - important
3. amperage 12 + v - important
4 modular - is not required, but I like the flexibility
5. guarantee
6 i7 and SLI ready
7. energy efficiency
8 cost
9. size - standard ATX PSU is 5.5 "by 5.9" by 3.4 "give or take a few tenths
10. a single + 12 volt rail is a better choice.

www.Newegg.com has many choices of power supplies. Corsair, OCZ, Rosewill, Thermaltake...

The typical EVGA GTX 570 in 9 "long.  The adjacent slot on the PCI-E x 16 slot must be vacant.  Open your PC and do some measures so that you know for sure if the card fits.  According to me, it will fit.

For what is a PSU, Corsair CX600has very little growth, but the Corsair HX650gives you plenty of space to grow.

I use the HX650 in two PC.  It is a modular model in order to have better options with the selection of cable.

"How-to" HP articles should be useful.

TIP: When installing the power supply, unlock the scanner and slide it forward to facilitate the removal and installation of the new power supply.

Tags: HP Desktops

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