Re: Why in the world would you disable any BIOS shadow ?. (nt)

Video BIOS Shadow (Disabled)

In old graphics cards (1 MB video memory), copying the video BIOS into the system memory could increase the graphics performance of the system. The only drawback is that the video BIOS will take up base memory addresses and, thus, possibly interfere with other devices because of resource overlapping.

For all modern graphics adapters, the setting should be disabled since there is no performance increase noted and the possibility to encounter errors because of occupying other necessary system resources increases.

System BIOS Shadow (Disabled)

Once the BIOS is loaded, there is no reason to shadow it in the main memory. Similar as with the Video BIOS, it will only occupy base memory addresses and, thus, make them unavailable for other system devices.

Sounds familiar.