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Using more color depth slows down video functions Data moving from the video card to the display has to go through the video card s memory chips and the expansion bus, and this can happen only so quickly The standard PCI slots used in almost all systems are limited to 32-bit transfers at roughly
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4:3 5:3 4:3 4:3 16:10 16:9 5:4
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Typical Device
PDAs and small video players Car navigation systems and ultra mobile PCs Small monitors Monitors and portable projectors Small widescreen laptops Lowest resolution that can be called HDTV Native resolution for many desktop LCD monitors Widescreen laptops Laptop monitors and high-end projectors Large laptops and 20" widescreen monitors Larger CRT monitors Full HDTV resolution Big 24" widescreen monitors Big 30" widescreen monitors; requires dual-link DVI connector
WSXGA SXGA+ WSXGA+ UXGA HDTV 1080p WUXGA WQUXGA
1440 900 1400 1050 1680 1050 1600 1200 1920 1080 1920 1200 2560 1600
16:10 4:3 16:10 4:3 16:9 16:10 16:10
15: Understanding Video
33 MHz, yielding a maximum bandwidth of 132 MBps This sounds like a lot until you start using higher resolutions, high color depths, and higher refresh rates For example, take a typical display at 800 600 with a fairly low refresh of 70 Hz The 70 Hz means the display screen is being redrawn 70 times per second If you use a low color depth of 256 colors, which is 8 bits (28 = 256), you can multiply all the values together to see how much data per second has to be sent to the display: 800 600 1 byte 70 = 336 MBps If you use the same example at 16 million (24-bit) colors, the figure jumps to 1008 MBps You might say, Well, if PCI runs at 132 MBps, it can handle that! That statement would be true if the PCI bus had nothing else to do but tend to the video card, but almost every system has more than one PCI device, each requiring part of that throughput The PCI bus simply cannot handle the needs of many current systems
Intel answered the desire for video bandwidth even higher than PCI with the Accelerated Graphics Port (AGP) AGP is a single, special port, similar to a PCI slot, which is dedicated to video You will never see a motherboard with two AGP slots Figure 1539 shows an early-generation AGP AGP is derived from the 66-MHz, 32-bit PCI 21 specification AGP uses a function called strobing that increases the signals two, four, and eight times for each clock cycle Simply describing AGP as a faster PCI Figure 1539 AGP would seriously misrepresent the power of AGP AGP has several technological advantages over PCI, including the bus, internal operations, Cross Check and the capability to handle 3-D texturing Multiple Actions per Clock Cycle First, AGP currently resides You ve run into devices in the PC that can handle multiple actions duralone on its own personal data ing a single clock cycle, right Refer back to s 3 and 4 and cross bus, connected directly to the check your memory Which CPUs can clock double What advantages Northbridge (see Figure 1540) does that bring to the PC Which types of RAM run faster than the sysThis is very important because tem clock What chip or chips enable the PC to benefit from multi- acmore advanced versions of AGP tion CPUs and RAM outperform every bus on the system except the frontside bus! Second, AGP takes advantage of pipelining commands, similar to the way CPUs pipeline Third, AGP has a feature called sidebanding basically a second data bus that enables the video card to send more commands to the Northbridge while receiving other commands at the same time
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
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