Helps a lot if you tell us what motherboard you are using, if you expect to receive a good answer.
Go to newegg.com only buy ones rated five stars with a lot of reviews.
* Top Quality (based upon electrical capabilities): PC Power & Cooling, Seasonic, Zippy, Silverstone, Enermax, Antec, Acbel, Akasa, AMS, Channel, Corsair, Etasis, Hiper, Mushkin, OCZ, NZXT, Scythe, Tagan, Thermaltake, Ultra, Zalman.
* Low Quality (based upon RMA rate and intended application of value-line computers): A-TOP, Aerocool, APEX, Aspire, Asus, ATADC, Athena Power, ATRIX, BFG, Broadway, Coolmax, Deer, Delta, Diablotek, Dynapower, EagleTech, Enhance, Enlight, E-Power, FOXCONN, Futurepower, I-Star, InWin, JPAC, Just PC, Kingwin, Linkworld, Lite-On, Logisys, Masscool, MGE, MSI, NMEDIAPC, Norwood Micro, NorthQ, Powmax, Q-Tec, Raidmax, Rosewill, SFC, Sintek, Shuttle, Skyhawk, Spire, Star Micro, STARTECH, Sunbeam, TOPOWER, TTGI, Wintech, XClio, XION, YoungYear, Zebronics.
* Disputed Brands (deemed to be of good quality, but needing referenced reviews or articles): CoolerMaster, HIPRO.
You motherboard should state the type of power supply it requires. ATX, Micro ATX, BTX, CFX, TFX, etc.
Some motherboards have more than one 12 volt rail and need a power supply with extra 12 volt legs.
For power supply pinouts refer to
Some companies such as Dell and HP use special plugs. If your motherboard does and you use a standard power supply without an adapter you will fry your motherboard.
Usually your video card will determine the smallest power supply you can use. Size it for the best card you will ever install. The card specs will state something like a minimum rating of 450 watts with 24 amps on the 12 volt leg of the power supply that supplies the video card. Usually you will need to get a power supply with a higher wattage rating to meet the minimum amperage requirement.
8800Ultra Superclocked 768MB
Minimum of a 500 Watt power supply with +12 Volt current rating of 34 Amp Amps. Two available 6-pin Molex hard drive power dongles
Minimum of a 400 Watt power supply with +12 Volt current rating of 22 Amp Amps.
Minimum 450 Watt for SLI mode system with +12 Volt current rating of 24 Amp Amps. An available 6 pin PCI-E power connector (hard drive power dongle to PCI-E 6 pin adapter included with card)
How to replace a power supply
Buy a new power supply:
Graphics card gaming performance charts:
How to pick the perfect graphics card
DirectX 9 vs 10
Mobile Graphics Cards - Benchmark List
CPU gaming performance charts:
· 1 decade ago