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

Q. 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 – ($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) – ($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 – ($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 ) – ($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 – ($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) – ($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) – ($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 – ($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 – ($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 – ($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

A. 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).

Original Question

I have a Dell Inspiron with an HDMI port and a vga port on the back. can I attach a monitor to each port?

Q. Will windows 7 run three monitors, the lcd monitor on the laptop, one monitor on the HDMI port and a third monitor off the vga port? If so how do I configure it in windows settings?

A. i would imagine so , plug them all in and see what happens , wont do any harm, i know windows can support many monitors at one time , and i would imagine that it should be clever and except 2 different forms or input ! when you plug them in go to settings , appearance , screens (along those lines) and you can adjust the resolution / position on external displays.

hope this helps :)

Original Question

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