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How to know what power supply you need

Last response: in Systems
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June 10, 2012 8:24:33 PM

Hello,
i am building my first computer and i don't know which power supply i need can you help? me these are my specs:

-Intel Core i5-3570K Ivy Bridge 3.4GHz (3.8GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000

-radeon hd 7850 sapphire oc edition

-16gb ddr3 ram memory

-ASRock B75 PRO3 LGA 1155 Intel B75 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

-Western Digital Caviar Green WD10EZRX 1TB IntelliPower SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive

-ASUS Black Blu-ray Drive SATA Model BC-12B1ST/BLK/B/AS - OEM

-windows 7 home premium 64-bit OEM

More about : power supply

a c 136 B Homebuilt system
a b ) Power supply
June 10, 2012 8:42:05 PM

Graphics cards are the main power user in a computer so its safe to size your psu using this
http://www.realhardtechx.com/index_archivos/Page362.htm

Buy only 80+ bronze [ or better] rated units . Check that it has the power connectors you need . Esp pci-e power connectors for graphics cards

And you dont even need 8 gig of RAM for a gaming computer
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Best solution

June 10, 2012 8:53:27 PM

First of all:
Get only 8GB of RAM
Get this motherboard: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Get this power supply: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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June 11, 2012 3:29:59 PM

Due to the graphics card you need a 500w cpu; however, I'd hedge my bets esp for further additions with a 650w one.
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June 12, 2012 4:30:44 AM

Best answer selected by techguy123.
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June 12, 2012 4:33:14 AM

Hey Ironslice with this i can run a gtx 570 or i should stay with my radeon hd 7850?
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