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How would i know how much power i will need for my PC build?

Hello i am new to PC building and i am doing my first build, but i do not know how much power i will need! here is a list of the parts i am going to use

My PC Build.
Case - CoolerMaster HAF 912
GPU - ASUS R9 270X
MOBO - ASUS M5A97 LE R2.0 AM3 +
CPU - AMD FX 8320 Vishera 3.5GHz
RAM - G.SKILL Ripjaws X Series 8GB
HD - Western Digital 1TB
Extras - 200mm Coolermaster Megaflow
6 answers Last reply Best Answer
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  1. Best answer
    500W or more, with at least 24A on the 12V rail

    Here's a decent one, with 44A:
    XFX Core Edition PRO550W (P1-550S-XXB9) 550W ATX12V 2.2 & ESP12V 2.91 SLI Ready CrossFire Ready 80 PLUS BRONZE
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013
  2. aevm said:
    500W or more, with at least 24A on the 12V rail

    Here's a decent one, with 44A:
    XFX Core Edition PRO550W (P1-550S-XXB9) 550W ATX12V 2.2 & ESP12V 2.91 SLI Ready CrossFire Ready 80 PLUS BRONZE
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013



    ok good that means i am in the right boat because i was going to go with a corsair CX 600 W
  3. Yeah. But get the XFX, it's $4 less after rebate/shipping and it's higher quality.
    As for power, the XFX delivers 44A and the CX600 46A - both plenty for your needs.



  4. Round up. 150W + 190W = 340W.
    340W at 80% load on the 12v rail - 425W / 12v = 36A at least on the 12v.

    EVGA 500W - $39.99 [$29.99 w/ MIR] 40A on 12v
  5. aevm said:
    500W or more, with at least 24A on the 12V rail


    Even just measuring it's load power, 24A is not enough. You'll be pushing 118%+ Load on the 12v rail.
  6. MasterMace said:



    Round up. 150W + 190W = 340W.
    340W at 80% load on the 12v rail - 425W / 12v = 36A at least on the 12v.

    EVGA 500W - $39.99 [$29.99 w/ MIR] 40A on 12v


    You've counted the graphics card twice. The numbers in the first chart include the graphics card already.
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