cpus use up to 140 watts now a days but the graphics card will require a lot as well
http://educations.newegg.com/tool/psucalc/index.html
http://www.antec.outervision.com/PSUEngine
Video Card.
Depending on your wants/needs, $750 - $2000.
The OCZ StealthXStream is a great camping power supply.
CCL custom builds computer systems. Puget Systems is another company that will do a custom computer build for your home or business. Cyber Power will do computer builds for gaming.
dont think what your asking is even possible. I got my gaming comp from Best Buy and had them put in a stronger power supply and graphics. Its now a very nice comp but ran me about 1200.
With the amount of power modern gaming-oriented video cards draw, the case is fine as it is and everything else needs to be upgraded.
SRAM retains its contents as long as the power is connected
alienware> is not a computer itself and is a computer brand, the best computer for raw power is being used for commercial use but the best for gaming can be made yourself by using the highest end parts possible.
A user buying a home computer will most likely purchase a laptop or a desktop, depending on their needs for portability and space. They may prioritize features like processing power, storage capacity, and display quality. Additionally, the user will likely consider the operating system and brand reputation, as well as budget constraints. Overall, the decision will be influenced by their intended use, whether for work, gaming, or general browsing.
This depends on the screen type, the screen size, and also the computer's power. For example; a low power computer may use 200watts, where a high power gaming setup might use 800watts. A screen could use as little as 5watts, if it is a small LCD screen, while a big CRT monitor might use 200watts. Your screen should tell you it's power usage, as should your computer, if you examine the power supply.
hard drive
A gaming computer is basically a highest quality computer - they have the highest memory hard drive, most processing power, chunky graphics card, etc., etc. They use this top of the line stuff to show highest performance while playing your game. (Reducing lag, better resolution, etc.)