Epson Epson - Manual (Page 40)

Configuring shadow memory
You can enable video BIOS shadowing or configure shadowing
for specific option ROM memory blocks.
Note
For the best system performance, always leave the System
shadow and Video shadow options set to Enabled
(the default setting).
Your computer can access RAM faster than ROM. The options
on this screen allow your system to copy the contents of its
video ROM and any optional ROMs into RAM. When you use
shadowing, your system can perform certain operations faster,
providing a significant increase in performance.
Note
Some option ROMs cannot be shadowed; see the
documentation that came with your optional equipment for
information on shadowing the option’s BIOS ROM.
Configuring the advanced chipset
You can change values in the chipset register to optimize
performance. However, to avoid possible configuration
problems, it is a good idea to leave these options at their
default settings.
2-10 Running SETUP and Installing Drivers