barcode scanner code in java Testing Your New CPU in Software

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Testing Your New CPU
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The next step is to turn on the PC and see if the system boots up If life were perfect, every CPU installation would end right here as you watch the system happily boot up Unfortunately, the reality is that sometimes nothing happens when you press the On button Here s what to do if this happens First, make sure the system has power we ll be going through lots of power issues throughout the book Second, make sure the CPU is firmly pressed down into the socket Get your head down and look at the mounted CPU from the side do you see any of the CPU s wires showing Does the CPU look level in its mount If not, reinstall the CPU If the system still does not boot, double-check any jumper settings it s very easy to mess them up As the computer starts, make sure the CPU fan is spinning within a few seconds If it doesn t spin up instantly, that s okay, but it must start within about 30 seconds at the least
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The Art of Cooling
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There once was a time long ago when CPUs didn t need any type of cooling device You just snapped in the CPU and it worked
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Figure 371
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Installing the fan
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3: Microprocessors
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Well, those days are gone Long gone If you re installing a modern CPU, you will have to cool it Fortunately, you have choices
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OEM Fans OEM fans are included with a retail-boxed CPU OEM CPUs, on the other hand, don t normally come bundled with fans Crazy, isn t it OEM fans have one big advantage: you know absolutely that they will work with your CPU Specialized Fans Lots of companies sell third-party fans for different CPUs These usually exceed the OEM fans in the amount of heat they dissipate These fans invariably come with eye-catching designs to look really cool inside your system some are even lighted! (See Figure 372)
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Figure 372
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Cool retail fan
The last choice is the most impressive of all liquid cooling! That s right, you can put a little liquid cooling system right inside your PC case! Liquid cooling works by running some liquid usually water through a metal block that sits on top of your CPU, absorbing heat The liquid gets heated by the block, runs out of the block and into something that cools the liquid, and the liquid is then pumped through the block again Any liquid cooling system consists of three main parts:
A hollow metal block that sits on the CPU A pump to move the liquid around Some device to cool the liquid
And, of course, you need plenty of hosing to hook them all together! Figure 373 shows a typical liquid-cooled CPU A number of companies sell these liquid-cooling systems Although they look really impressive and certainly cool your CPU, the reality is that unless you re overclocking or want a quiet system, a good fan will more than suffice
Figure 373
Liquid-cooled CPU
Mike Meyers A+ Guide to Managing and Troubleshooting PCs
Whether you have a silent or noisy cooling system for your CPU, always remember to keep everything clean Once a month or so, take a can of compressed air and clean dust off the fan or radiator CPUs are very susceptible to heat; a poorly working fan can create all sorts of problems, such as system lockups, spontaneous reboots, and more
CPUs are thermally sensitive devices keep those fans clean!
Know Your CPUs
In this chapter, you have seen the basic components and functions of a PC s CPU A historical view has been provided to help you better understand the amazing evolution of CPUs in the more than 20-year life span of the personal computer The information in this chapter will be referred to again and again throughout the book Take the time to memorize certain facts, such as the size of the L1 and L2 caches, CPU speeds, and clock-doubling features These are facts that good technicians can spout off without having to refer to a book
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