Which Intel Core i7 proccesor would be better for gaming? The dual or the quad core?

The i3 isn't a quad-core, it's a dual-core with hyper-threading. If you want a gaming desktop computer, go for an i5 since it is a true quad-core. In addition, i3 processors don't turbo-boost like i5's do.

(Turbo-boost is disabling one or more cores but kicking up the clock speed so the processor can do single-threaded tasks faster without eating up extra power). You're looking at ~$200-250 for the processor, ~$50-$150 for the motherboard (depending on how much RAM, number of PCI slots for graphics cards and overclock support you want), ~$150 for a large capacity hard drive, ~$10/GB for RAM (so if you want to max it out at 32GB, then that's a lot of money -- but chances are you won't be able to use more than 8GB for gaming), and ~$100-$200 for a graphics card (depending on how fast you want it to be). I haven't looked as much into power supplies and cases, especially since the prices on them vary much more wildly -- I got a cheap case/power supply combo for $20, but I've seen individual cases and individual power supplies cost more than $120 *each.

* Plus you would need to have an operating system of some kind -- Windows isn't free unless you're a pirate. (But don't be a pirate). At the bottom, it would be somewhere close to $600 without the OS, assuming you get a low-end motherboard, score a good deal on an i5 2400 or 3550 (no overclock allowed), get 4GB of RAM, a mid-range graphics card ($100 for an Nvidia GT650 or Radeon HD 6x50), and a cheap case and power supply.

At the top, it's about $1000 for an i5 3570K (can be overclocked), a mid-range motherboard, 12GB RAM, a higher-end graphics card (670/680) and a decent case and power supply. The point of building your own computer is that you know what good components you want, and you can save money by buying cheaper/lower quality on the parts that aren't important to you. For example, you could save ~$100 by buying a smaller capacity hard drive, since chances are you can't really use all that hard drive space unless you like to store all your movies on your computer.

I would say $300-500. If you really want a good gaming experience, look for a high end graphics card. I personally prefer NVidia, but AMD is good to.

If you really want good graphics, make sure your computer has a dedicated graphics card. If you cannot afford a computer with one, I would recommend saving up and buying and installing it yourself. An enthusiast level graphics card can range between a good value at about $150 to insane performance at over $1000.

Also, if you can afford it, try for an i5 quad core processor with turbo boost and at least 8 gigs of ram (buy extra and install it manually if you have to). Do a little extra research, and make sure your new rig can play your favorite games on high enough settings to appease you. If you do not know what to play, I would recommend Skyrim or Black Ops 2.

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