what psu wattage should i use?

So I bought a ASUS P8Z77-V LX a few days ago and I was wondering how many Watts it requires (does not say on the box) but please help me here are my specs

CPU: Intel Core I3 3220 3.3Mhz
Motherbord: ASUS P8Z77-V LX
Graphics card: Geforce GTX 650 2GB SuperClocked
Hard Drive: Western Digital Caviar Blue 1TB
Power Supply: 550W ATX Power Supply
RAM/DDR5: Kingston 8gb 1600 Mhz

Issue: When I turn the computer on it turns off immediately and I am positive that it has something to do with my power supply because when I removed my GPU its fans spun for a more longer time but I am just confirming to see if I am correct
(all of the parts are brand new)

8 answers Last reply Best Answer
More about psu wattage
  1. Your graphics card needs only a 400w psu.
    I would hope that it is a quality psu or all bets are off.
  2. motherboards themselves aren't what consumes the wattage from the PSU, it's the CPU and GPU that account for most of the power usage. A GTX 650 system only requres approximately 450 watts, so your PSU is probably not the cause if it is from a reputable manufacturer such as Antec, Seasonic, XFX, Corsair, etc. Make sure your CPU heatsink is fully seated, it sounds like it may be a heat issue. Also, your CPU has integrated graphics, so if your system won't boot without the GTX 650 installed, I would suspect an overheating issue. If you have a speaker to attach to the motherboard (see your user manual) it should output a beep code and the manual should tell you what problem(s) the beeps mean.
  3. Could that really be the issue?, ALL of these parts were bought 2 days ago and they are brand new
  4. If your system is not booting, there could be any number of issues causing it not to boot:

    1. Is the CPU installed correctly?
    2. Is the heatsink installed properly?
    3. Is the RAM seated completely?
    4. Are all of the necessary PSU cables connected and seated as they should be?
    5. Did you use the motherboard standoffs between the motherboard and case? (They should have come with the case)
    6. and the list goes on.

    This is why it is generally a good idea to barebone your build outside of the case to insure everything is working properly before installing everything into the case.
  5. It wont start up at all it will just turn on... the fans will move and then turn right back off please helpp
  6. you could have a bad power supply, a short somewhere in your set-up, or something not connected properly (as I mentioned above). Refer to your motherboard user manual for troubleshooting guidelines.
  7. how do i check if i have a short? sorry i am kinda new to this :S
  8. Best answer
    to check for a short you would need to use a multimeter to check the voltages coming from the PSU. There are a number of different voltages that are supplied by the PSU, 3.3 volts; 5.0 volts; 12 volts; etc. Refer to your motherboard manual to see if it has places on it to measure them. If none of this makes sense to you, you will probably be better off taking your build to a shop/store and have them check it out, or get ahold of a friend who knows how to troubleshoot computers. Not meaning to sound like I am blowing you off, but troubleshooting can get complex and require tools/equipment/knowledge you may not have.
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