The graphic below compares the through-put for each of the common video
buses used as a Mother Board video interface to
a video monitor or display.
The graph compares the ISA bus [PC-AT bus], the PCI bus, each version of the
AGP bus, and then the
PCI Express bus. Each
of the interface buses is defined as a IBM-PC Expansion bus, or a video
expansion bus in the case of the AGP bus and PCIe bus. The graph uses the
maximum bus speed / through-put so the actual transfer speed will be
lower, but the speed improvement remains. The actual speed of the ISA bus
is near 1MBps once bus over-head is taken into account, but makes little
difference compared to the 133MBps PCI through-put. Also the PCI-Express
through put may be nearer 4000MBps, but compared to the 2000MBps of AGP
x8 speed makes little difference, the transfer speed is double.
Not shown is version II of the PCIe bus which increases the bus speed to
10GBps.
As of 2005 AGP video boards were still in demand, there are many legacy motherboards. The new
motherboard used to generate this web site uses an 8x AGP bus. Although
the AGP bus is out-dated and a PCIe bus is required, it takes time for uses to up-grade their systems. Expansion boards using x4 AGP cards certainly require an up-grade.
Any board using a standard before AGP x4 is obsolete and requires an
up-grade, which would require a Mother Board Up-Grade.
Back to the main PC Video Monitor Bus page [Cable
Pinout], or to the main PC Interface Bus page
[Board Descriptions].
Use the Buses icon at the bottom of the page to reach the top
level index for all bus types.
Use the Equipment icon at the bottom of the page to reach
manufacturers of PC Monitors.
Electronic Design Key words: Video bus, Video Interface, Throughtput, Through put, Pinout, Speed, Cable, Comparison, Compare, Signal Names, Computer Bus, Slot, Monitor, Display, Physical Interface, Connector, PC, Personal Computer.
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