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P H 4 4 0 N L X M o t h e r b o a r d U s e r G u i d e
2D Display modes and maximum frame rates
640 x 480
800 x 600
1024 x 768
1152 x 864
1280 x 1024
1600 x 1200
Frame
Buffer
MB
2
2
4
4
4
8
8
AGP
The Accelerated Graphics Port (AGP) is hardware interconnect designed to improve the
performance of 3D graphics displays. The specification is based on PCI but is point-to-point and
provides for data rates over 500MBps. The implementation on this motherboard is a private local
bus between the chipset and the Rage Pro video controller. The bus can operate in 1X or 2X
modes as defined by the AGP specification. When a Rage IIc device is fitted the interface
between the 443BX North Bridge and the VGA controller operates as a 66MHz PCI bus and no
AGP signalling occurs.
Two levels of performance gain are achieved:
2D Operation. Since the AGP operates at 66MHz, twice the data rate of the PCI bus is
available to normal video traffic.
3D Operation (Rage Pro only). Address translation logic and 133MHz bus mastering
allows the video controller to maintain texture information in main memory - reducing the
need for a large frame buffer.
3
These are the primary display modes. Others are available.
4
Front and back buffers.
5
Main memory can be used for additional texture storage via AGP.
MITSUBISHI ELECTRIC MOTHERBOARD DIVISION
256 colours
2MB
200
200
150
120
100
76
Screen
Colour
Resolution
Depth
Bits/pixel
512 x 384
16
640 x 480
16
640 x 480
16
640 x 480
32
800 x 600
16
1024 x 768
32
1280 x 1024
16
3
65536 colours
2MB
4MB
200
200
200
200
150
150
120
120
100
76
Display
4
Buffer
MB
0.38 x 2
0.59 x 2
0.59 x 2
1.17 x 2
0.92 x 2
3.00 x 2
2.50 x 2
S e p t e m b e r 1 9 9 8
16.7M colours
2MB
4MB
200
200
160
160
120
85
85
Z Buffer
Texture
5
Memory
MB
0.38
0.88
0.59
0.24
0.59
2.24
0.59
1.07
0.92
1.25
1.50
0.50
2.50
0.50
PAGE 22 OF 51
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