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Chapter 10—Video and Audio
Table 10.16 Local Bus Specifications
Feature PCI AGP
Theoretical maximum 132MB/sec1 533MB/sec throughput (2X)
1.06GB/sec throughput (4X)
Slots2 4/5 (typical) 1
Plug and Play support Yes Yes
Cost Slightly higher Slightly higher than PCI
Ideal use High-end 486, Pentium II, III, Celeron,
Pentium, P6 AMD K6, K7
1. At the 66MHz bus speed and 32 bits. Throughput will be higher on the 100MHz system bus.
2. More slots are possible through the use of PCI bridge chips.
Obviously, of the three local-bus standards, AGP is the fastest, but only very recent systems offer
AGP video. Use Table 10.17 to determine what your best video upgrade is, depending on your
system.
Table 10.17 Best Video Upgrades by CPU and Slot Type
CPU Slot Type Best Option Notes
486 VL-Bus No current video cards Buy used or surplus;
available in VL-Bus; replace motherboard;
obsolete. retire system.
486 PCI Buy any low-cost PCI Verify that card will work
card with at least 4MB with 486; some require
of RAM. Pentium.
Pentium, K6 PCI Buy PCI card with at Choose a card with a
MII least 8MB of RAM; look chipset that can be used
for DVD playback, TV as secondary video in case
out as desirable you move to AGP later
features. by upgrading to a new
motherboard or by
moving the card to a
system with AGP.
Pentium II/ AGP Buy AGP card with AGP upgrade is
III/Celeron 16MB or more RAM; available only on systems
K6/Athlon should support AGP 2X with AGP slot. Many
Duron or faster speed; look for low-cost systems have
DVD playback, TV out AGP video on motheras
desirable features; board only; must use
DVI option desirable PCI for upgrade (see
for display upgrades. previous table entry).
Table 10.18 lists motherboard chipsets that support AGP. Note that
the use of this chipset doesn’t guarantee that every system using
this chipset on its motherboard will be capable of accepting an
AGP card because integrated AGP video is common on many lowcost
systems today.