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How do you know how many watts are needed from a PSU for a build?

Hello all,

What I want to know is how you know how many watts are needed for a system build,

Thanks all :)
18 answers Last reply Best Answer
More about watts needed psu build
  1. What I normally do is Google a review of the Graphic card. Look for power consumption. Then add 20%->30% to the listed wattage (make sure it says SYSTEM and not just card). If planning on adding a 2nd GPU in SLI/Xfire then google that configuration.

    1) Always try to select a PSU from tier 2 (Tier 1 are generally much higher priced) and do NOT select less than a tire 3 PSU.
    2) PSU calculators are nice except they take into account that you may have/buy a tier 4 or Lower PSU and retire a generally higher value than really needed.
  2. also the most energy hangry device of a pc is the gpu so it is crucial to know how many watts a gpu (needs)consumes to run properely. so use this for a general perspective
    http://forum-en.msi.com/faq/article/power-requirements-for-graphics-cards
  3. Well, i'm going to list the build, I don't know how to find out the wattage..

    Cpu: AMD FX-6300
    http://www.amazon.co.uk/AMD-FX6300-Edition-4-1GHz-Socke...

    Motherboard: MSI 970A-G46
    http://www.amazon.co.uk/970a-g46-Motherboard-Raid-Gigab...

    Ram: Corsair Select 4GB
    http://www.amazon.co.uk/Corsair-CMV4GX3M1A1333C9-Select...

    Graphics Card: Asus HD7770-DC-1GD5-V2
    http://www.amazon.co.uk/dp/B007RS49EG/?tag=pcp0f-21

    PSU: Corsair Builder Series CX430Watt
    http://www.amazon.co.uk/Corsair-Builder-Series-Bronze-Supply/dp/B009RMP14M/ref=sr_1_2?ie=UTF8&qid=1390067486&sr=8-2&keywords=CX430M

    HDD: 1TB Western Digital Caviar Blue HDD
    http://www.amazon.co.uk/Western-Digital-internal-Hard-D...

    Case: Fractal Design Core 1000
    http://www.amazon.co.uk/Fractal-Design-Core-Series-Micr...

    The power supply is a CX430 Watt, will that cover the build?

    Thanks :)
  4. 1 you need at least the 2gb of the 7770
    2 4bg is the absolute minimum better get 8gb
    3 you need a more capable psu.its beraly enough. something like this will also allow you a future gpu upgrade
    http://www.amazon.co.uk/Corsair-Builder-Series-Modular-Certified/dp/B00ALYOTTI/ref=sr_1_1?ie=UTF8&qid=1390153907&sr=8-1&keywords=corsair+CX600m
  5. chris987 said:
    1 you need at least the 2gb of the 7770
    2 4bg is the absolute minimum better get 8gb
    3 you need a more capable psu.its beraly enough. something like this will also allow you a future gpu upgrade
    http://www.amazon.co.uk/Corsair-Builder-Series-Modular-Certified/dp/B00ALYOTTI/ref=sr_1_1?ie=UTF8&qid=1390153907&sr=8-1&keywords=corsair+CX600m


    ...

    I'm going to upgrade in the FUTURE, all I want to know is if the PSU can cover the build.

    And I can't pay 30 pounds more, 350 is my budget
  6. It's not a very good PSU.

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($44.99 @ Amazon)
    Total: $44.99
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2014-01-19 13:03 EST-0500)
  7. SR-71 Blackbird said:
    It's not a very good PSU.


    Low quality? Not enough watts? Why is it not very good lol
  8. Low quality cheap capacitors , but will run your specs.

    I would get this one.

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($44.99 @ Amazon)
    Total: $44.99
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2014-01-19 13:03 EST-0500)
  9. SR-71 Blackbird said:
    Low quality cheap capacitors , but will run your specs.

    I would get this one.

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($44.99 @ Amazon)
    Total: $44.99
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2014-01-19 13:03 EST-0500)


    Ok so, it's bad because it's likely to break? Ok well, is this one better?

    Corsair CX500M

    http://www.amazon.co.uk/Corsair-Builder-Series-Modular-Certified/dp/B00ALK1GFC/ref=sr_1_1?ie=UTF8&qid=1390154812&sr=8-1&keywords=Corsair+CX500M
  10. All CX series supplies are poor.
  11. SR-71 Blackbird said:
    All CX series supplies are poor.


    Ok, thanks for the info. So should I use that power supply? The Corsair Builder Series CX430Watt,
    In 2 months or so I will most likely upgrade it and add another 4gb module of ram. Will it work for that long?
  12. The CX430 wil run your specs , then upgrade later.
  13. the evga is better quality better go with that if you cant afford the 600w corsair ,which even its a lower quality can provide a better future upgrade
  14. It seems that the Evga 500w or whatever is only 10 pounds more, i'm just going to buy that one instead of the 430w corsair, I don't want to risk breaking all the parts.

    Is it this one?

    http://www.amazon.co.uk/EVGA-500B-BRONZE-Power-Supply/dp/B00DZ6R9GE/ref=sr_1_1?ie=UTF8&qid=1390157834&sr=8-1&keywords=evga-power-supply-100b10500kr
  15. Best answer
    Yes that is the one.
  16. It always depends on what stuff youreusing but if its a budget build i would use the cx500 or cx430 and corsair or xfx for psu
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