What PSU do I need for my gaming computer?

Hi all,

I am building a gaming PC and have got everthing sorted except the PSU. I have tried numerous wattage calculators and the results range from 400w-600w, which I think is quite a big gap. Any ideas as to what wattage I should get would be greatly appreciated. These are the specs:

Case: Cooler Master Elite 430
Motherboard: Asus M5A78L-M/USB3 AM3+
CPU: AMD FX-8150 8-Core
GFX Card: Asus Nvidia GeForce GT 640
HDD: 350GB 7200rpm Drive (Not sure what one yet :P)
RAM: Corsair Vengeance 8GB (2x 4GB)
Optical Drive: Sony DVD/CDRW Combo
CPU Cooler: Standard AMD heatsink or an aftermarket one
Case Fans: 1x Intake fan w/ blue LEDs, 2x Sharkoon Silent Eagle 1000 120mm case fan

Pretty sure that's everything. If you have any suggestions for any parts, feel free to leave them here also, but keep in mind: it's a budget PC!

Thanks!
12 answers Last reply
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  1. i would say 400w would be closer

    as thats a very low power graphics card

    my suggestion would be split the difference and get a 500w from a good maker

    antec,seasonic,corsair etc

    500w should allow you to upgrade a bit in the future
  2. mcnumpty23 said:
    i would say 400w would be closer

    as thats a very low power graphics card

    my suggestion would be split the difference and get a 500w from a good maker

    antec,seasonic,corsair etc

    500w should allow you to upgrade a bit in the future


    I know the graphics card isnt the best, but it has good reviews and is cheap. I have been looking around for a 750w because I really hadnt a clue what to get, but thanks!
  3. i know its cheap :)

    still everyone has a budget

    but it depends what you want to use it for

    not sure about good reviews though

    would have thought a 7750 would be better at about the same price

    and a 7770 a bit dearer but definitely better
  4. MentalTiger said:
    I know the graphics card isnt the best, but it has good reviews and is cheap. I have been looking around for a 750w because I really hadnt a clue what to get, but thanks!


    Just don't go cheap on the power supply. You can get a cheap 750W power supply cheaper than a good 450W supply and still not be able to get 450W from the cheap one.
  5. For a system using a single GeForce GTX 640 graphics card NVIDIA specifies a minimum of a 350 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 20 Amps or greater.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most important factor.

    Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum 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 being attempted.
  6. ko888 said:
    For a system using a single GeForce GTX 640 graphics card NVIDIA specifies a minimum of a 350 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 20 Amps or greater.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most important factor.

    Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum 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 being attempted.


    I dont think I will be overclocking any time soon, so what power supply would be able to handle all this? 500w?
  7. jnkweaver said:
    Just don't go cheap on the power supply. You can get a cheap 750W power supply cheaper than a good 450W supply and still not be able to get 450W from the cheap one.


    I was looking at maybe a corsair psu, they seen to be used in loads of builds
  8. MentalTiger said:
    I was looking at maybe a corsair psu, they seen to be used in loads of builds

    The Corsair Builder Series CX430 (SKU# 75-001666 / CP-9020046-UK), with its maximum combined +12 Volt continuous current rating of 32 Amps and with one (6+2)-pin PCI Express supplementary power connector, is way more than sufficient to power your system configuration with a single GeForce GTX 640 graphics card.

    Corsair Builder Series 80+ Bronze CMPSU-430CXV2UK 430W Power Supply (PSU) for £28.43 Ex VAT (£34.12 Inc VAT)
    http://www.scan.co.uk/products/430w-corsair-builder-series-cmpsu-430cxv2uk-80plus-bronze-eff-uncertified-quiet-fan-atx-v23-psu
  9. As a reply to those suggesting a new graphics card, I have looked around and found a PNY Nvidia GTX 550TI graphics card. Seems a bit of a fuel guzzler, about 400w needed apparently, would that change anything?
  10. mcnumpty23 said:
    i know its cheap :)

    still everyone has a budget

    but it depends what you want to use it for

    not sure about good reviews though

    would have thought a 7750 would be better at about the same price

    and a 7770 a bit dearer but definitely better


    Looked at the 7770 and didnt seem too much better, think I will settle for the PNY GeForce GTX 550 Ti
  11. For a system using a single GeForce GTX 550 Ti graphics card NVIDIA specifies a minimum of a 400 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 24 Amps or greater and that has at least one 6-pin PCI Express supplementary power connector.

    The Corsair Builder Series CX430 (SKU# 75-001666 / CP-9020046-UK) is still more than sufficient to power a system using this graphics card.
  12. New graphics card I'm getting (GeForce GTX 550 Ti) has to have 400w being chucked into it. Hope a 500w will still be fine
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