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Certainly the "local computer guy" is a myth in the sense of that guy having a shop out of which to work. The Big Box stores have taken over pretty much. Oddly enough, it's sometimes easier to find a local shop in a smaller town if there's a market at all. There's a guy in the town where I grew up who still has a shop that he's had since, oh, 1984 or so. Town only has a population of around 15,000 and can't support a Best Buy or what have you. His biggest competition is Wal Mart and mail order.
The larger power requirement is largely a function of graphics cards. High-end "gamer" systems can have up to four high-end, power hungry graphics cards in them sucking out every last drop of power they can pull. The higher requirements of operating systems is indeed a part of this since all the eye candy requires a decent graphics card all by itself, and then the games, the 3D modeling, the playing of 1080p video all put a heavy strain on the graphics subsystem. But these systems are vast overkill for most people. Hell, some of them aren't even necessary for the people who use them, but those people *think* they need all that horse power or simply want it for bragging rights. Gamer forums will often give some insight into this. My piddly dual-core system that was high-end four years ago can play most modern games just fine, and it really torks some people I've just managed to smash to pieces in an online game when they find out I'm running an old Buick while they've got a modern Ferrari. It's turned into golf. "My game sucks ... I must need a new club." So, they go out and spend a billion dollars on a new set of custom made clubs, but their game still sucks.
As for liquid cooling, no one really *needs* that. That continues to be the arena of hardcore over-clockers and those who just like the bling for the sake of bling. In fact, one of the advances in motherboard and CPU technology has been, overall, to reduce the power requirements of the CPUs and to build boards with proper advanced heat sinks and heat control systems that don't even require the kind of case ventilation that was necessary four years ago. Of course, exceptions exist, but, again, this is the world of the over-clockers, which tend to be hardcore those gamers.
The quad-core system I built for my cousin not long ago, to use an example, doesn't go over 50 degrees Celsius at load, and it's using the stock CPU heat sink and fan. It also has a 430W power supply, which supplies more than the juice she needs.
And I guarantee you I can still fix most systems less expensively than you can purchase a new one *of the same quality*. Sure, you can get really cheap systems, but they're not good systems. They are the kind they are hard to work on and aren't really meant to last more than a couple years.
If you really want a quality system you have to build it yourself or find the hidden local shop or individual who can do it for you. That system I built for my cousin would have cost her around $1200. I actually modeled it off a system she'd seen that she thought was "pretty." The one she got was actually better, and I put it together for around $800, OS, monitor, and a small amount for my labor included.
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