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How many watts psu do i need for AMD Radeon R7 240 1gb ddr5 graphic card

Hi, I recently brought SAPPHIRE AMD Radeon R7 240 1gb ddr5 graphic card and it says 400 watts psu require but mine is 450 watts, when I install the card and start my pc a massage appears something like "power fails____" (i was unable to read the whole massage) then i again start my pc the cpu fan was running but the power led of my pc was off and when I remove the graphic card system work fine. so i want to know is something wrong with my psu, if yes then how many watts psu do i need.
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  1. http://www.realhardtechx.com/index_archivos/Page362.htm
    Acording to this site,recommend power supply for the R7 240 is 350W,so your PSU should be more than enough.
    What PSU do you have?
  2. LukaBoki said:
    http://www.realhardtechx.com/index_archivos/Page362.htm
    Acording to this site,recommend power supply for the R7 240 is 350W,so your PSU should be more than enough.
    What PSU do you have?


    my psu is umax
  3. Best answer
    Im having trouble finiding it here: http://www.tomshardware.co.uk/answers/id-1804779/power-supply-unit-tier-list.html
    But I dont think it's a quality PSU. I think you should upgrade your PSU to another,higher quality 450W PSU.
  4. LukaBoki said:
    Im having trouble finiding it here: http://www.tomshardware.co.uk/answers/id-1804779/power-supply-unit-tier-list.html
    But I dont think it's a quality PSU. I think you should upgrade your PSU to another,higher quality 450W PSU.


    can you suggest which one should I buy
  5. Best answer
    Of course.
    XFX Pro/Core 450W is a great and a very reliable PSU.
    Make sure to choose a solution if i helped. :)
  6. LukaBoki said:
    Of course.
    XFX Pro/Core 450W is a great and a very reliable PSU.
    Make sure to choose a solution if i helped. :)

    Thanks for your support
  7. aza27 said:
    LukaBoki said:
    Of course.
    XFX Pro/Core 450W is a great and a very reliable PSU.
    Make sure to choose a solution if i helped. :)

    Thanks for your support


    No problem,glad I could help.
  8. I have AppoinTech 500w psu, will it be good for R7 240 GDD5 1 GB ?
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