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How many watts will I need for this spec?

Hi everyone, I think I have a faulty PSU because my computer keeps crashing during stress like Crysis 2. I have a Seasonic PSU:

http://ncix.com/products/?sku=52173&vpn=S12II%20520&manufacture=Seasonic%20Electronics

Could someone please tell me how many watts I will need in order to be stable?

Thanks a lot


Oops I forgot about the specs, here they are:

Mobo: ASUS M4A87TD
GPU: Radeon HD 7950
CPU: AMD Phenom II X4 965 Black Edition
RAM: 8GB
25 answers Last reply Best Answer
More about watts spec
  1. Well it would help if you listed your whole system specs but since your running crysis 2 I assume your cpu and graphics is pretty decent. I would recommend at least 700w but please note this is a complete estimate based on the information you provided.
  2. Oops I forgot about the specs, here they are:

    Mobo: ASUS M4A87TD
    GPU: Radeon HD 7950
    CPU: AMD Phenom II X4 965 Black Edition
    RAM: 8GB
  3. What are the symptoms and is your system overclocked? How's the temperature? Are there any viruses in your system?


    A Seasonic S12II 520 is more than powerful enough for one 7950 and a P4 965BE. It is from a great manufacturer and is of a very high quality build so i doubt it's the culprit but you never know.
  4. Best answer
    Ok, I think your cpu will use about 100W (unless you overclock) so 150
    Radeon 7950 - I would say 200-300
    Ram - lower than 100
    Mobo - not sure... maybe 100 or more.

    After doing the math the numbers are close to 600 so 700 would be enough
    Note that it could not be the psu and some other issue.
  5. fgin23 said:
    Ok, I think your cpu will use about 100W (unless you overclock) so 150
    Radeon 7950 - I would say 200-300
    Ram - lower than 100
    Mobo - not sure... maybe 100 or more.

    After doing the math the numbers are close to 600 so 700 would be enough
    Note that it could not be the psu and some other issue.


    Okay thanks, I'm pretty sure that my PSU was the culprit. Can a shortage of 80 watts cause the comp to crash? that's what I think is the problem
  6. leech33s said:
    Okay thanks, I'm pretty sure that my PSU was the culprit. Can a shortage of 80 watts cause the comp to crash? that's what I think is the problem


    A shortage of any amount of watts is not good.
  7. For a system using a single reference clocked Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

    Overclocking of the CPU and/or GPU(s) (i.e. factory or manual) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

    The Seasonic S12II Bronze Series 520W (S12II-520Bronze), with its combined +12 Volt continuous current rating of 40 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7950.

    Unless you're doing some extreme overclocking the PSU should be more than sufficient.
  8. ko888 said:
    For a system using a single reference clocked Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

    Overclocking of the CPU and/or GPU(s) (i.e. factory or manual) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

    The Seasonic S12II Bronze Series 520W (S12II-520Bronze), with its combined +12 Volt continuous current rating of 40 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7950.

    Unless you're doing some extreme overclocking the PSU should be more than sufficient.


    According to this post the PSU is not the source of your problem
  9. Describe the crash.

    Do you get a blue screen of death or any error messages that may indicate the cause?

    Have you checked the Windows Event logs for Error events?
  10. fgin23 said:
    According to this post the PSU is not the source of your problem


    Then what's the problem? Ugh... please reply fast I have to go to computer shop in ten minutes because of this power supply. What should I do? My CPU AND PSU weren't overheating right before the time of crash.

    Sorry I didn't mean to sound grumpy I just typed in a hurry.

    And oh to ko888, there's no prior warning, screen just goes poof and comp shuts off.
  11. WE NEED INFORMATION. Answer the above queries! Any overclock? Error screens? BSOD's? Viruses?
  12. lilotimz said:
    WE NEED INFORMATION. Answer the above queries! Any overclock? Error screens? BSOD's? Viruses?


    No overclock (but I intend to do it when I achieve stability)
    No error screens, comp just goes poof and pitch black and shuts off
    No BSOD
    No viruses
  13. leech33s said:
    Then what's the problem? Ugh... please reply fast I have to go to computer shop in ten minutes because of this power supply. What should I do? My CPU AND PSU weren't overheating right before the time of crash.

    Sorry I didn't mean to sound grumpy I just typed in a hurry.

    And oh to ko888, there's no prior warning, screen just goes poof and comp shuts off.

    I'm not saying that the PSU isn't defective but if its working properly you shouldn't be experiencing a loss of power event. The OCP trip point may have been set too low from the factory.

    Does the problem also occur when you run Furmark GPU stress testing?
  14. If I were you I would just go for a higher watt psu and see if the problem continues.
  15. fgin23 said:
    If I were you I would just go for a higher watt psu and see if the problem continues.

    That's pointless
    His X4-965BE draws 25 watts or so less than the I7-965XE in this review of the 7950

    http://www.guru3d.com/article/powercolor-radeon-hd-7950-pcs-review/8

    Lack of power isn't the problem unless the psu is faulty, not because it can't provide much more than enough
  16. Leech: Check your system event log to see what errors you are getting when your system shuts down. Instructions: http://windows.microsoft.com/en-us/windows-vista/Open-Event-Viewer Tell us the errors that you are getting prior to shutdown.

    Modify your shutdown behavior so that you get a BSOD (Blue Screen of Death) instead of your system shutting down. Instructions: http://pcsupport.about.com/od/tipstricks/f/automatic-restart.htm
  17. ko888 said:
    For a system using a single reference clocked Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

    Overclocking of the CPU and/or GPU(s) (i.e. factory or manual) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

    The Seasonic S12II Bronze Series 520W (S12II-520Bronze), with its combined +12 Volt continuous current rating of 40 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7950.

    Unless you're doing some extreme overclocking the PSU should be more than sufficient.



    rubbish you can use watts instead


    watts =volts*amps

    so at 12v and 40amps = 480watts


    if your psu has different rails work them out using that method above
  18. shanky887614 said:
    rubbish you can use watts instead


    watts =volts*amps

    so at 12v and 40amps = 480watts


    if your psu has different rails work them out using that method above


    So this is 514 watts ?
  19. ko888 said:
    For a system using a single reference clocked Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

    Overclocking of the CPU and/or GPU(s) (i.e. factory or manual) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

    The Seasonic S12II Bronze Series 520W (S12II-520Bronze), with its combined +12 Volt continuous current rating of 40 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7950.

    Unless you're doing some extreme overclocking the PSU should be more than sufficient.



    hahaha i think i have seen you post this or something similar about 20 times.
  20. fgin23 said:
    Ok, I think your cpu will use about 100W (unless you overclock) so 150
    Radeon 7950 - I would say 200-300
    Ram - lower than 100
    Mobo - not sure... maybe 100 or more.

    After doing the math the numbers are close to 600 so 700 would be enough
    Note that it could not be the psu and some other issue.


    More like,

    CPU is rated at 140 watts, but will not take THAT much
    Video card will have trouble hitting 200(this would be without pushing powertune up). Closer to 150 is most games
    Ram 100? What? would be lucky if a stick of memory took 5 watts(and most should NOT).
    Motherboards can vary lots, but 100 may be too much as well.

    Point in case, no shortage of power.

    As listed above, if you have a power issue, it is a defective power supply, not an actual lack of power.

    I ran a 955BE @ 3.7/5870 with a 550 watt power supply from OCZ. Your power supply is better.

    To add to this my 2600K @ 4.4 with a 5870 2 hard drives and 2 ssds and a 5870 never pulls over 300 from the wall :)

    This was my 955BE system just for reference. I may have pulled more with some tweaks(prime can load the cpu to the point that the video card can not work as hard), but you get the point.

  21. leech33s said:
    Hi everyone, I think I have a faulty PSU because my computer keeps crashing during stress like Crysis 2. I have a Seasonic PSU:

    http://ncix.com/products/?sku=52173&vpn=S12II%20520&manufacture=Seasonic%20Electronics

    Could someone please tell me how many watts I will need in order to be stable?

    Thanks a lot


    Oops I forgot about the specs, here they are:

    Mobo: ASUS M4A87TD
    GPU: Radeon HD 7950
    CPU: AMD Phenom II X4 965 Black Edition
    RAM: 8GB

    in reality it only need about 400 or less so i'd recommend a 500 w so u'll have a little less surplus. Look at some benchmarks with 7970, they only reach i don;t know maybe 300 or less with intel cpu and mobo and ram with it. the 100W is for cooling system and overclocking
  22. Best answer selected by leech33s.
  23. Thank you everyone, the culprit was the lack of watts in the PSU!
  24. leech33s said:
    Thank you everyone, the culprit was the lack of watts in the PSU!

    Was only a lack of watts if the psu was faulty
  25. delluser1 said:
    Was only a lack of watts if the psu was faulty

    +999999
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