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What power Supply Unit do you recommend with this computer?

I have a Pentium D dual core 3.0 ghz, An XFX 8600 GT 512 mb, 2 hard drives both western digital one is a 80 gb while the other is a 500 gb and running 1.5 gb ram... I currently have a 250 Watt power supply but it keeps getting spiked and burns out after 3/4 months of usage.
So what powersupply do you recommand with this computer?

Let's see what your max theoretical power draw is by heading over to my fave psu calc http://www.extreme.outervision.com/psucalculatorlite.jsp and putting in your components:
PD930 (3ghz) / 2 x ddr2 / 2 x hdd / 1 x dvdrw / 4 x fans / 8600gt

I get about 242W so you are definitely pushing that unit pretty hard.

I would get a unit that can handle at least that much on the +12v combined power such as one of these:

FSP Group SAGA+ 400R 400W http://www.newegg.com/Product/Product.aspx?Item=N82E16817104953
$37 w/ free shipping

This is a good budget choice, FSP is well known for reliability and can handle +12v@276w combined max http://c1.neweggimages.com/NeweggImage/productimage/17-104-953-18.jpg

If you can afford a nicer one this is an excellent choice

CORSAIR CMPSU-400CX 400W http://www.newegg.com/Product/Product.aspx?Item=N82E16817139008
$60 w/ $10 MIR & free shipping

it can handle +12@30A / 360W http://c1.neweggimages.com/NeweggImage/productimage/17-139-008-08.jpg and corsair needs no defending the quality of it's product.

If you didn't know already, the +12v is the most important since both the CPU and GPU get the power from the +12v - your old 250w is probably +12v@14A / 168W max, and your system is currently straining trying to keep up. Putting your total system draw as a guideline for the +12v max is a method that ensures your system will operate within the rated power for the power supply without getting a unit that is overkill, and will last for years to come. If you anticipate any upgrades, plug them into the PSU calc and reevaluate your power requirements then lather, rinse, repeat. Since not all power supplies are created equal, stick with brands (or at least OEM brands) that have a good reputation, and try not to be sold on the total wattage and focus on the +12v power handling.

cheers

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Choosing Between Different Types of Uninterruptible Power Supply

Business processes these days increasingly rely on technology, which by default relies on a clean and reliable source of electricity. As more and more industries turn to computerization, mechanization and automation, an unprecedented strain is being placed on already overworked electricity infrastructures around the world. It has taken the developed world by surprise. Managers are now faced with the real prospect of energy rationing and power supply issues. If any part of their business cannot continue without electricity, they have to find alternative ways of securing supply and/or generating their own. Making the correct choice of uninterruptible power supply (UPS) is now more important than ever.

What’s an uninterruptible power supply (UPS)?

A UPS sits between the mains supply and ‘the load’ (equipment and systems in a building or datacenter that need a continuous source of electricity). At its simplest, a UPS conditions electrical current, converts it from AC to DC, and negates potentially harmful power problems including sags, surges, brownouts and fluctuations. In the case of a total mains power outage, the UPS powers the load from its back-up battery until another energy source starts up. Put simply, an uninterruptible power supply can mean the difference between life and death for some businesses.

Different types of UPS

There are three primary types of uninterruptible power supply:

• Online or Double Conversion

• Line Interactive

• Offline (or Passive Standby).

An Online or Double Conversion UPS maintains voltage and frequency variations within prescribed limits so output is independent of supply fluctuation. As well as conditioning mains power to negate problems, this is the only UPS solution that provides break-free supply to the plant or datacenter during a power outage.

A Line Interactive UPS uses built-in passive electronic regulation devices to stabilize and regulate voltage fluctuations. When mains supply power is present, the output frequency of the UPS tracks the input of the mains. Line Interactive and On-Line UPS use tower or ‘rackmount’ case formats and sit next to their respective loads, typically in a datacenter or computer room.

An Off-Line or Passive Standby UPS is a compact device designed for desktops or Wall Mounting, which uses its own output to track voltage and frequency variations in the mains supply power.

Extended UPS benefits

As well as obvious continuity and power conditioning advantages for a datacenter or computer room, larger uninterruptible power supplies can work in parallel to improve system resilience, MTBF (mean time between failure) and availability.

For a network-sized uninterruptible power supply, the installation of an external UPS maintenance bypass enables routine or emergency maintenance to be carried out (without supply disruption) during normal working-hours.

Extended runtime (the time a load is running on back-up power) can be provided by a combination of extra battery packs and an external standby power source such as a generator or fuel cell.

The transformer-based UPS system

While many UPS are transformerless, organizations reliant on larger datacenter and voice networks, industrial processes, security or hospital applications, often require transformer-based uninterruptible power supply. This gives greater robustness, albeit with slightly lower efficiency and greater heat and noise generation.

Essential protection against power outage and rationing

As well as industrial processes, uninterruptible power supplies may be used to protect large site-wide installations. From the smallest desktop units to the largest parallel redundant installations, a correctly sized, reliable UPS system, provided by an established manufacturer such as Riello UPS Ltd, offers essential protection against the growing risks of power outage and power rationing.

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