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Sound output in the PC has two basic components, the sound card and speakers Most PCs use sound cards built into the motherboard, though these are not as good as stand-alone cards Most built-in sound lacks a dedicated sound processor, relying on the CPU for the processing power This eats into CPU time and reduces overall performance Built-in sound usually picks up interference from the rest of the motherboard, thus leading to a noticeable hiss, especially when listening through headphones A dedicated sound card particularly in Windows 2000 and Windows XP offers an inexpensive performance enhancing upgrade that should be done for most systems Windows Vista offers a different story, though, because it lacks support (at least at this writing) for dedicated sound processors Vista requires sound processing through the OS and thus through the CPU Speakers, much more than the sound card built-in or dedicated make a huge difference in customer satisfaction This won t show up on the CompTIA A+ certification exams, but it is useful information nonetheless Spend the extra small amount of money to get better speakers If you can fit only a 21 set, then go for the big subwoofer and nice satellites, like those shown in Figure 1027 Sound cards install and configure like every other expansion device Install the card, and then install updated drivers Plug things into the right ports and they ll work fine
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FIGURE 1027
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The video system in PCs is composed of two complex pieces, the video card and the monitor The video card handles the commands from the CPU and OS and then sends commands to the monitor to update and change what it displays
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As far as the CompTIA A+ certification exams go, you can treat a video card whether stand-alone or built into the motherboard just like any other expansion card It goes into the appropriate slot, AGP or PCIe, for the most part, and you install drivers Use the Device Manager when you set it up to make sure everything works right The Display Control Panel applet (Figure 1028) enables you to make changes to the function of the video card (or display adapter) Just giving you the CompTIA A+ certification line on video cards would be a disservice, even in a cram-style book, because a properly chosen and set up video card can make an amazing difference in the performance of a computer, especially when it comes to gaming, image editing, and 3-D modeling Plus, Windows Vista uses 3-D video card processing extensively, so you need to know about video cards in the real world The video card is composed of two major pieces: the video RAM and the video processor circuitry The video RAM stores the video image On the first video cards, this RAM was good old dynamic RAM (DRAM), just like the RAM
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CHAPTER 10 Adapter Cards and Peripherals
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FIGURE 1028
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on the motherboard Today s video cards often have better RAM than your system has The video processing circuitry takes the information on the video RAM and shoots it out to the monitor While early video processing circuitry was little more than an intermediary between the CPU and the video RAM, modern video processors are more powerful than all but the latest CPUs! It s not at all uncommon to see video cards that need fans to cool their onboard processors (see Figure 1029) Video card discussion, at least among techs, almost always revolves around the graphics processor they use and the amount of RAM onboard A typical video card might be called an ATI Radeon X1950 XTX 512 MB, so let s break that down ATI is the manufacturer, Radeon X1950 XTX is the model of the card as well as the graphics processor, and 512 MB is the amount of video RAM Your choice of graphics processor is your single most important decision in buying a video card Low-end graphics processors will usually work fine for the run-of-the-mill user who wants to write letters or run a Web browser High-end graphics processors are designed to support the beautiful 3-D games that are so popular today
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