Apple Power Macintosh 8600 - Manual (Page 107)

VRAM configurations
Video RAM (VRAM), like standard DRAM, is also provided in DIMMs.
Your computer comes with 2 MB of VRAM installed in two 1 MB DIMMs.
(These DIMMs are installed in the two bank 1 slots.) Your computer’s VRAM
can be expanded to a maximum of 4 MB by adding two 1 MB DIMMs to the
two bank 2 slots. Both DIMMs must be added at the same time.
IMPORTANT The VRAM DIMMs must be 32-bit wide, 112-pin fast-paged
mode with 70-ns RAM access time or faster. Do not use the 256K or 512K
VRAM SIMMs used in older Macintosh computers.
Note: If you install additional VRAM and later remove it, make sure to leave
the remaining 2 MB of VRAM installed in the bank 1 slots. You will not be
able to use a TV as a monitor if the VRAM is installed in the bank 2 slots.
For more information about using a TV as a monitor, see Chapter 7,
“Connecting Additional Equipment.”
Cache configurations
Your computer comes with a cache module already installed. To find out the
exact size of the included cache module, see the “Memory” section in your
Technical Information booklet.
You can replace the existing cache module with a larger one. Cache modules
are currently available from third-party manufacturers in various sizes up to
1 MB. However, Apple recommends that you use an Apple-brand cache
module if you want to upgrade your existing cache.
107 Installing PCI Expansion Cards and Additional Memory