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Pci x pci extended pci x available in such systems as

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Unformatted text preview: GP slot. Figure 8-9 AGP slot NOTE The AGP slot is almost universally brown in color, making it easy to spot. PCI-X PCI Extended (PCI-X), available in such systems as the Macintosh G5, is a huge enhancement to current PCI that is also fully backward compatible in terms of both hardware and software. PCI-X is a 64-bit-wide bus (see Figure 8-10). Its slots will accept regular PCI cards. The real bonus of PCI-X is its much enhanced speed. The PCI-X 2.0 standard features four speed grades (measured in MHz): PCI-X 66, PCI-X 133, PCI-X 266, and PCI-X 533. Figure 8-10 PCI-X slot The obvious candidates for PCI-X are businesses using workstations and servers, because they have the “need for speed” and also the need for backward compatibility. Large vendors, especially in the high-end market, are already on board. HP, Dell, and Intel server products, for example, support PCI-X. A quick online shopping trip reveals tons of PCI-X stuff for sale: gigabit NICs, Fibre Channel cards, video adapters, and more. Mini-PCI PCI has even made it into laptops in the specialty Mini-PCI format (Figure 8-11). You’ll find Mini-PCI in just about every laptop these days. Mini-PCI is designed to use low power and to lie flatboth good features for a laptop expansion slot. Mini-PCI returns in Chapter 21, “Portable Computing.” ch08.indd 297 12/14/09 2:49:21 PM All-In-One / CompTIA Network+ All-in-One Exam Guide / Meyers & Jernigan / 170133-8 / Chapter 8 CompTIA A+Certification All-in-One Exam Guide 298 Figure 8-11 Tiny card in MiniPCI slot. See the contacts at the bottom of the picture? PCI Express PCI Express (PCIe) is the latest, fastest, and most popular expansion bus in use today. As its name implies, PCI Express is still PCI, but it uses a point-to-point serial connection instead of PCI’s shared parallel communication. Consider a single 32-bit chunk of data moving from a device to the CPU. In PCI parallel communication, 32 wires each carry one bit of that chunk of data. In serial communication, only one wir...
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