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Chapter 10—Video and Audio
Table 10.13 Video Display Adapter Minimum Memory
Requirements—2-D Operation Continued
Number RAM on Memory
Resolution Color Depth of Colors Video Card Required
1,024×768 4-bit 16 512KB 393,216 bytes
1,024×768 8-bit 256 1MB 786,432 bytes
1,024×768 16-bit 65,536 2MB 1,572,864 bytes
1,024×768 24-bit 16,777,216 4MB 2,359,296 bytes
1,280×1,024 4-bit 16 1MB 655,360 bytes
1,280×1,024 8-bit 256 2MB 1,310,720 bytes
1,280×1,024 16-bit 65,536 4MB 2,621,440 bytes
1,280×1,024 24-bit 16,777,216 4MB 3,932,160 bytes
From this table, you can see that a video adapter with 2MB can display
65,536 colors in 1,024×768 resolution mode, but for a true
color (16.8M colors) display, you would need to upgrade to 4MB or
reduce resolution to 800×600.
Although many of the newest video cards on the market today
have memory sizes of 8MB, 16MB, or even 32MB, this additional
memory will not be used for 24-bit color in high resolutions for
2-D graphics unless the display resolution exceeds 1,280×1,024 at
24-bit color. The additional RAM is used for 3-D texture mapping
and display caching.
Use Table 10.14 to determine whether you have sufficient display
memory for the desired 3-D video operation.
Table 10.14 Video Display Adapter Memory Requirements—
3-D Operation
On-Board Actual
Resolution Color Depth Video RAM Memory Required
640×480 16-bit 2MB 1.77MB
640×480 32-bit 1 4MB 2.93MB
800×600 16-bit 4MB 2.76MB
800×600 32-bit 1 8MB 4.58MB
1,024×768 16-bit 8MB 4.50MB
1,024×768 32-bit 1 8MB 7.50MB
1,280×1,024 16-bit 8MB 7.50MB
1. Although 3-D adapters typically operate in a 32-bit mode, this does not necessarily mean that
they can produce more than the 16,277,216 colors of a 24-bit true color display. Many video
processors and video memory buses are optimized to move data in 32-bit words, and they actually
display 24-bit color while operating in a 32-bit mode, instead of the 4,294,967,296 colors
that you would expect from a true 32-bit color depth.