PC Architecture. A book by Michael B. Karbo

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The video card port was moved from the south to the north bridge. The new architecture gives optimal access to RAM and hence to the bandwidth which the 3D games require. At the same time, the PCI system is spared from the large amount of graphic data traffic to and from the video card. It can now focus on the other intensive transfer tasks, such as transfer to and from the network adapter and disk drive. Fig. 154. AGP Video card from ATI. Technical details AGP consists of a number of different technical elements, of which I will highlight two: ● A bus structure built around a double-clocked PCI bus. ● The ability to use the motherboard RAM as a texture cache. The texture cache is used by games, and by giving access to the motherboard RAM, less RAM is needed on the cards. The AGP bus is actually a 64-bit variant of the PCI bus. You can also see that on the surface, the motherboard AGP slot looks a fair bit like a PCI slot. But it is placed in a different position on the motherboard, to avoid confusion (see Fig. 156). The slot also has a different colour. The first version of AGP was 1X, with a bandwidth of 254 MB/sec. But AGP was quickly released in a new mode, called 2X, with 508 MB/sec. Later came 4X and 8X, which are the standards today. This involves a clock doubling, just as we have seen, for example, with DDR RAM. Two or four data packets are sent for each clock pulse. In this way, a bandwidth of 2,032 MB/sec has been reached.
Texture cache and RAMDAC Textures are things like backgrounds in games. They can be uploaded directly from RAM to the video card. The system is called DIME (Direct Memory Execute). This allows the video card memory to be extended using standard RAM on the motherboard. In Fig. 155 you can see the system shown graphically. In this figure you can also see the RAMDAC device. This is a chip on the video card which looks after the “translation” of digital data into analogue signals, when the card is connected to an analogue screen. The RAMDAC is a complete little processor in itself; the higher it’s clock frequency, the higher the refresh rate with which the card can supply the screen image. Fig. Figur 155. The AGP bus provides direct access to RAM. Video card on PCI Express With the new PCI Express bus, we get a new system for the video card. Replacing the AGP, the PCI Express X16-bus offers a transfer of 8 GB/sec, which leaves plenty of room for even the most graphical-intensive pc games.
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PC Architecture - a book by Michael
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● Next chapter. ● Previous chap
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Copyright Michael Karbo , Denmark,
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IBM-compatible PCs, and as the year
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8 bit 8080 Small CP/M based home co
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In the winter of 1939 Atanasoff was
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Copyright Michael Karbo and ELI Aps
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Fig. 12. Cray supercomputer, 1976.
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Internal devices External devices M
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Fig. 21. Underneath the hard disk y
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Fig. 24. The motherboard is the hub
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Fig. 27. Here you can see three (wh
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Fig. 31. At the bottom left, you ca
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● Higher clock frequencies (which
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Which CPU? Fig. 35. The underside o
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Fig. 38. A CPU is shown here withou
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Fig. 39. If you are not sure which
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Fig. 44. The two chips which make u
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Sound facilities in a chipset canno
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● Other network, screen and sound
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Fig. 54. The CPU’s working speed
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Less power consumption The types of
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1993 Pentium 0.8/0.5/0.35 microns 1
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Fig. 67. The latest generations of
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Fig. 68. Cache RAM is much faster t
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AMD Athlon 64 64 bits 2200 MHz 17,6
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Fig. 78. The WCPUID program reports
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As the years have passed, changes h
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The pipeline is like a reverse asse
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Motorola G4 4 500 MHz Motorola G4e
Page 73 and 74: Fig. 91. In the Pentium 4, the inst
Page 75 and 76: Fig. 92. Re-writing numbers in floa
Page 77 and 78: will become. ● Improvements to th
Page 79 and 80: point numbers with just one instruc
Page 81 and 82: The first PC’s were 16-bit machin
Page 83 and 84: another in all later generations of
Page 85 and 86: Fig. 105. L2 cache running at half
Page 87 and 88: Fig. 108. Extreme CPU cooling using
Page 89 and 90: Copyright Michael Karbo and ELI Aps
Page 91 and 92: Figur 112. The LGA 775 socket for P
Page 93 and 94: Figur 114. In the Athlon 64 the mem
Page 95 and 96: Figur 116. There are scores of diff
Page 97 and 98: present, CPU’s and motherboards h
Page 99 and 100: Fig. 119. With this architecture, t
Page 103 and 104: Figur 124. A gigantic cooler with t
Page 107 and 108: Module or chip size All RAM modules
Page 109 and 110: Fig. 135. Older RAM modules. FPM RA
Page 111 and 112: In the beginning the problem with D
Page 113 and 114: However, RAM also has to match the
Page 115 and 116: Modern motherboards for desktop use
Page 117 and 118: The new architecture is used for bo
Page 119 and 120: Figur 148. Report from the freeware
Page 121 and 122: Fig. 150. In reality, the RAM needs
Page 123: Fig. 152. The data path to the vide
Page 127 and 128: opportunities for extension really
Page 129 and 130: Clock freq. 66 - 1066 MHz Typically
Page 131 and 132: Figur 162. The features in this mot
Page 135 and 136: Fig. 168. ISA based Sound Blaster s
Page 137 and 138: As a result of all this, the periph
Page 139 and 140: Fig. 174. Using the CMOS setup prog
Page 143 and 144: Figure 44. The two chips which make
Page 145 and 146: Figure 47. The chipset’s south br
Page 147 and 148: Figure 51. This PC has two sound ca
Page 149 and 150: You will most likely want to have t
Page 151 and 152: The trend is towards ever increasin
Page 153 and 154: A grand new world … We can expect
Page 155 and 156: here. Wafers and die size Another C
Page 159 and 160: Figure 69. A cache increases the CP
Page 161 and 162: Celeron (later gen.), Pentium III,
Page 163 and 164: Athlon 64 128 KB 512 KB Athlon 64 F
Page 165 and 166: Xeon processors are incredibly expe
Page 167 and 168: You can no doubt see that it wouldn
Page 171 and 172: Intel Pentium 4 (first generation)
Page 173 and 174: Figure 90. The passage of instructi
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AMD’s 32 bit Athlon line can bare
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FPU - the number cruncher Floating
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for 32-bit integers, and one for 80
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Figure 101. Two 486’s from two di
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Figure 105. L2 cache running at hal
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As was mentioned earlier, the older
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Figur 112. The LGA 775 socket for P
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The Opteron is the most expensive a
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Figure 120. The bus system for an 8
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Figure 123. Setting the CPU voltage
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Figure 129. A 512 MB DDR RAM module
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DDR2-400 400 MHz DDR2 RAM DDR2-533
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Figure 137. The motherboard BIOS ca
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Of course you want to choose the be
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Under the Processes tab, you can se
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Figure 147. The architecture surrou
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Figure 149. The new chipset archite
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At the same time, the PCI system is
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Figure 156. The black PCI Express X
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Figure 157. The south bridge connec
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● The MCI, EISA and VL buses - fa
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Figure 164. The ATA interface works
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The ISA bus is thus the I/O bus whi
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MCA from 1987 Advanced I/O bus from
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Figure 172. The PCI bus is being re
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Figure 174. Using the CMOS setup pr
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Figure 178. The keyboard controller
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IRQ’s. It didn’t take much befo
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Memory-mapped I/O All devices, adap
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Figure 188. Here is the Audigy card
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Finally, I will look at the FireWir
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The super I/O controller is connect
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Figure 196. In the middle you see t
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Figure 200. The UART controller rep
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number of different SCSI standards.
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Figur 205. SCSI hard disks anno 200
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Figure 207. A USB-based trackball -
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USB has thus made the serial ports
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Figure 211. In the middle of the pi
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Figure 213. An SATA-hard disk (here
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from the disk. This magnetism will
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In the ”old days”, interfaces s
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Figure 220. This motherboard has an
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Figure 224. Jumper to change betwee
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Figure 228. An ATA-RAID controller
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The existing PATA system has a limi
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CMOS and Setup The startup program
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Figure 237. Standard CMOS Features
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Figure 239. Advanced Chipset Featur
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Figure 241. The system information
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have seen, in the ROM circuits on t
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To perform an upgrade you first dow
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DMA. Direct Memory Access. A system
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PC Architecture. A book by Michael B. Karbo

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