Computer Setup (F10) Utility Guide
20 www.hp.com Computer Setup (F10) Utility Guide
Computer Setup (F10) Utility
Advanced* 
(continued)
Power-On Options 
(continued)
Allows you to set:
• I/O APIC Mode (enable/disable). 
Enabling this feature will allow Microsoft 
Windows Operating Systems to run 
optimally. This feature must be disabled 
for certain non-Microsoft Operating 
Systems to work properly.
•ACPI/USB Buffers @ Top of Memory 
(enable/disable). Enabling this feature 
places USB memory buffers at the top 
of memory. The advantage is that 
some amount of memory below 1 MB is 
freed up for use by option ROMs. The 
disadvantage is that a popular memory 
manager, HIMEM.SYS, does not work 
properly when USB buffers are at top of 
memory AND the system has 64 MB or 
less of RAM.
• Hyper-threading (enable/disable).
• Limit CPUID Maximum Value to 3 - 
Restricts the number of CPUID functions 
reported by the microprocessor. Enable 
this feature if booting to WinNT.
*For advanced 
users only.
BIOS Power-On Allows you to set the computer to turn on 
automatically at a time you specify.
Onboard Devices Allows you to set resources for or disable 
onboard system devices (diskette controller, 
serial port, or parallel port).
Computer Setup (Continued)
Heading Option Description
✎
Support for specific Computer Setup options may vary depending on the hardware 
configuration.










