Tyan Computer Q35T, S5520 warranty Memory Cache, Cache System Bios Area, Cache Video Bios Area

3.3.2 Memory Cache

This setting allows you to tweak the various cache settings for optimal performance of your system.

Press [Enter] to display the various cache settings.

	Main	PhoenixBIOS Setup Utility
		Advanced	Security	Power		Boot	Exit
		Memory Cache			Item Specific Help
Cache System BIOS area:			[Write Protect]		Controls caching of
Cache Video BIOS area:			[Write Protect]
					system BIOS area.
Cache Base 0-512K:			[Write Back]
Cache Base 512K-640K:			[Write Back]
Cache Extended Memory Area:			[Write Back]
Cache A000 – AFFF:			[Disabled]
Cache B000 – BFFF:			[Disabled]
Cache C800 – CBFF:			[Disabled]
Cache CC00 – CFFF:			[Disabled]
Cache D000 – D3FF:			[Disabled]
Cache D400 – D7FF:			[Disabled]
Cache D800 – DBFF:			[Disabled]
			[Disabled]
Cache DC00 – DFFF:
			[Write Protect]
Cache E000 – E3FF:
			[Write Protect]
Cache E400 – E7FF:
			[Write Protect]
Cache E800 – EBFF:
			[Write Protect]
Cache EC00 – EFFF:
F1	Help	↑↓ Select Item	-/+Change Values			F9	Setup Defaults
Esc	Exit	← → Select Menu	Enter Select	X Sub-Menu		F10 Save and Exit

Cache System BIOS Area

This feature is only available when the system BIOS is shadowed. It enables or disables the caching of the system BIOS ROM at F0000h-FFFFFh via the L2 cache. This greatly speeds up accesses to the system BIOS. However, this does not necessarily make the system perform better because the OS does not need to access the system BIOS often.

As such, it would be a waste of L2 cache bandwidth to cache the system BIOS instead of data that are more critical to the system's performance. In addition, if any program writes into this memory area, it will result in a system crash. So, it is recommended that you write protect this area for optimal system performance.

Options: uncached / Write Protect

Cache Video BIOS Area

This feature is only valid when the video BIOS is shadowed. It enables or disables the caching of the video BIOS ROM at C0000h-C7FFFh via the L2 cache. This greatly speeds up accesses to the video BIOS. However, this does not necessarily make the system perform better because the OS bypasses the BIOS and uses the graphics driver to access the video card's hardware directly.

As such, it would be a waste of L2 cache bandwidth to cache the video BIOS instead of data that are more critical to the system's performance. In addition, if any

37