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Introduction EP-6CXA2C
Page 1-9
Accelerated Graphics Port
(AGP or A.G.P.)
Typically, 3D graphics rendering requires a tremendous amount of memory, and
demands ever increasing throughput speed as well. As 3D products for the
personal computer become more and more popular, these demands will only
increase. This will cause a rise in costs for both end users and manufacturers.
Lowering these costs as well as improving performance is the primary motivation
behind AGP. By providing a massive increase in the bandwidth available between
the video card and the processor, it will assist in relieving some of these pressures
for quite sometime.
The EP-6CXA2C provides the AGP 2.0 interface. The AGP Interface Specifica-
tion revision 2.0 enhances the functionality of the original AGP Interface Specifi-
cation (revision 1.0) by allowing 4X data transfers (4 data samples per clock) and
1.5 volt (power supply) operation. The AGP 2.0 interface, along with Direct
Rambus memory technology, allows graphics controllers to access main memory
at over 1GB/s. In order to match the 1X, 2X and 4X AGP Card. The EP-6CXA2C
used the Universal AGP connector. To maximize add-in flexibility. (such as 1.5
volt for 1X, 2X and 4X or 3.3 volt for 1X and 2X AGP Card).
Bandwidth Overview
Table 1 provides a summary of the bandwidth requirements for the Intel
®
820 chipset.
Table 1: Intel
®
820 platform Bandwidth Summary
e c a f r e t n I
d e e p S k c o l C
) z H M (
r e P s e l p m a S
k c o l C
e t a R a t a D
) s / s e l p m a s - a g e M (
h t d i W a t a D
) s e t y B (
h t d i w d n a B
) s / B M (
s u B U P C 3 . 3 3 1 / 0 0 1 1 3 . 3 3 1 / 0 0 1 8 6 6 0 1 / 0 0 8
M A R D R
0 0 4 / 6 5 3 / 0 0 3 2 0 0 8 / 2 1 7 / 0 0 6 2 0 0 6 1 / 4 2 4 1 / 0 0 2 1
0 . 2 P G A
6 . 6 6 4 6 6 2 4 6 6 0 1
k n i L b u H 6 . 6 6 4 6 6 2 1 6 6 2
2 . 2 I C P 3 . 3 3 1 3 . 3 3 4 3 3 1