How many watts of power will I need for my gaming computer?

best gaming pc setup under 500 image

Dope

This summer I plan on building my own gaming PC and assembling it at home because it is cheaper and I like to customize things myself. It is an 850 dollar computer but the specs are exceptional. For the motherboard and processor, I am following a YouTube tutorial. In the YouTube video it says only 500 watts of power are needed, but in the comment section somebody (who was picked for best answer) claims that you actually need at least 630. I am planning on getting a 750 watt battery anyways, but if I don't need to, I'll try and get something cheaper. So how much power will I need based on this setup:

Processor:
Intel Core i5-3470 Quad-Core Processor 3.2 GHz 4 Core LGA 1155 - BX80637I53470 â ($188.79)
http://www.amazon.com/gp/product/B0087EVHVW/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0087EVHVW&linkCode=as2&tag=c09_11-20

Graphics Card:
Gigabyte Radeon HD 7850 Graphics Card (2GB) â ($194.99)
http://www.amazon.com/Gigabyte-mini-Displayport-PCI-Express-Graphic-GV-R785OC-2GD/dp/B007PJTNYS/ref=sr_1_1?s=electronics&ie=UTF8&qid=1365971519&sr=1-1&keywords=amd+radeon+hd+2+gigabyte

Motherboard:
MSI LGA1155/Intel B75/DDR3/SATA3 USB 3.0/A&GbE/MicroATX Motherboard B75MA-P45 â ($64.99)
http://www.amazon.com/gp/product/B008S8WA18/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B008S8WA18&linkCode=as2&tag=c09_11-20

Ram:
Corsair Vengeance 8 GB (2 x 4 GB ) â ($59.98)
http://www.amazon.com/gp/product/B004CRSM4I/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B004CRSM4I&linkCode=as2&tag=c09_11-20

Hard Drive:
500GB Western Digital Caviar Blue Hard Drive â ($59.99)
http://www.amazon.com/gp/product/B00461G3MS/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B00461G3MS&linkCode=as2&tag=c09_11-20




Power Supply:
Corsair CX750 Builder Series ATX 80 PLUS Bronze Certified Power Supply (750W) â ($88.24)
http://www.amazon.com/gp/product/B0092ML0MY/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0092ML0MY&linkCode=as2&tag=c09_11-20

Optical Drive:
Asus 24xDVD-RW Serial ATA Internal OEM Drive DRW-24B1ST (Black) â ($20.04)
http://www.amazon.com/Asus-24xDVD-RW-Serial-Internal-DRW-24B1ST/dp/B0033Z2BAQ/ref=sr_1_2?s=electronics&ie=UTF8&qid=1365953829&sr=1-2&keywords=optical+drive

Tower:
NZXT Technologies SOURCE 220 CA-SO220-01 Matt Steel Mesh Front Mid Tower Case with USB 3.0 â ($68.98)
http://www.amazon.com/gp/product/B0066130AO/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0066130AO&linkCode=as2&tag=c09_11-20

Operating System:
Windows 7 System Builder â ($95.88)
http://www.amazon.com/gp/product/B0094NY3R0/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B0094NY3R0&linkCode=as2&tag=c09_11-20

(Monitor:)
ASUS VS197D-P 18.5-Inch HD LCD Monitor â ($89.24)
http://www.amazon.com/ASUS-VS197D-P-18-5-Inch-LCD-Monitor/dp/B005PAIVII/ref=sr_1_3?ie=UTF8&qid=1365972998&sr=8-3&keywords=Cheap+Computer+Monitors+Under+100

Answer
500W (or greater) power supply with one 75W 6-pin PCI Express power connector recommended

http://www.amd.com/us/products/desktop/graphics/7000/7850/Pages/radeon-7850.aspx#2

Thus, for a system with a single HD7850, a good branded 600W PSU is the ideal one to get and since your mobo does not support crossfire, then that 750W is too much for that build since Xfire is already not possible.

BTW, for Xfire, amd recommends 600W minimum, thus 700W is the ideal one to have (just an added info).

What Components Should I Use For A Custom Gaming PC?

Xenon

Okay. So I want to build my first computer, typically for gaming because my laptop sucks. I need to ask you people, who are probably smarter than me, what components I should use. I have already decided on my RAM (2 Corsair Vengeance Blue 16 GB DDR3 SDRAM Dual Channel Memory Kits), but I want to know what CPU I should use, what the best motherboard is for it, what graphics card I should get, and so on. So here are my 'guidelines', if you may.
Graphics Card: Under $800, can handle some good graphics (Portal 2, Battlefield 3, so on)
CPU: Preferably Intel, since AMD runs really hot. Under $600.
Hard Drive: I would like an SSD, but they're quite expensive. Areound 750GB-1TB or bigger, under $500.
Optical Drive: Not as needed, but if you could recommend some good ones that would be cool.
Power Supply: Nothing special, I guess. If there are good ones that can boost performance that would be great.
If there is anything I missed, please tell me and I'll look up some.
I didn't miss the monitor, mouse, keyboard, and case, I already know what I want for those.

Answer
GPU - GTX 780

CPU - 4770K

SSD - Crucial M500 960GB SATA 2.5" 7mm (with 9.5mm adapter) Internal Solid State Drive CT960M500SSD1 - $650

UNDER $500 - you can only get up to 512gb SSD at newegg.

PSU - 850W corsair (for SLI setup in the future) or corsair 650W PSU for a system with a single GTX 780.

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