Since the early 2000s, the Ars System Guides have been helping those interested become "budding, homebuilt system-building tweakmeisters." This series is a resource for building computers to match any combination of budget and purpose.
The main Ars System Guide is great for what it is—an updated, step-by-step look at the best components for an all-around desktop build. But even this beast has some limitations and a few gaps. And if our System Guide build got much bigger, it might not ever get published.
In particular, there are sizeable gaps between the Budget Box (our low-end, affordable build) and the Hot Rod (that "just right" bowl of build porridge). Quite frankly, there's also an enormous gap between the Hot Rod and the God Box (where money is no obstacle). But if you do a focus shift from capable-all-around boxes with gaming capability to boxes that are purely gaming focused, you have an equally seismic shift. There's where the newest System Guide comes in. Meet the special Gaming Boxes.
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via http://arstechnica.com/gadgets/2013/04/ars-technica-system-guide-gaming-boxes-april-2013/