Generally, if you have no major problems, these settings should be fine. But if you run into problems, adjusting these BIOS settings may help you. It is recommended that you adjust only a few settings at a time, rather than all of them at once. (Write down the original value for any settings you change first!) 

These are the settings Tweak3D recommends: 

Assign IRQ to VGA (or video) - Enabled or set to "Auto". The GeForce 256 requires an IRQ to operate. 

Video BIOS cacheable - Disabled or default. This may cause problems if enabled, and it did not boost performance in our tests. 

Video BIOS shadow - Disabled. This may cause problems if enabled, and it did not boost performance in our tests. 

VGA Palette Snoop - Disabled. This is an old feature that is not required by the GeForce 256. 

PCI Palette Snoop - Disabled. This is somewhat like the feature above. It should not be enabled for the GeForce 256.