Well the people listing exact components and brand names built their PCs from the ground up, so thats how they know.
As for how you can find out what you have, if you are using windows right click on my computer and choose properties, a box will come up. In the lower right corner it will give you info on your processor and your RAM. For info on your GPU(s) you click the "Hardware" tab at the top and then hit the "Device Manager" button. A new window will pop up with an expandable tree list...you want to expand "Display Adapters" and your video card will be listed there.
That will get you the three main pieces of information. And remember to hit cancel when exiting those windows just to make sure that you don't change anything (unless you want to change something, in which case make sure you know what you're doing).
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