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Air Flow
This item allows the user to set the desired speed of air fl ow to the DIMM mod-
ules. Each increment is one mm/sec. The default is [1500]. Press "+" or "-" on
your keyboard to change this value.
Altitude
This item allows the user to specify the altitude of the location where the com-
puter is used. For Tylersburg-EP platforms, system memory thermal solution
is derated up to 900m. To comply with CPU specifi cations, BIOS will attempt
to adjust and correct DIMM velocity based on the altitude where the system is
located in order to improve DIMM thermal performance. Altitude is defi ned as the
number of feet above the sea level where the computer is located. The options
are Sea Level or Below, 1~300 (above-), 301~600 (above-), 601~900 (above-),
901~1200 (above-), 1201~1500 (above-), 1501~1800 (above-), 1801~2100
(above-), 2101~2400 (above-), 2401~2700 (above-), and 2701~3000 (above-)
the sea level.
DIMM Pitch
Use this feature to specify the distance of physical space between each DIMM
module. Each step is in 1/1000 of an inch. The default is [400]. Press "+" or "-"
on your keyboard to change this value.
Performance Tuning Mode (Available when both XMP memory and an
Extreme Edition CPU are installed.)
This item allows the user to choose the Intel Extreme Memory Profi le (XMP) Speci-
fi cation which enables DDR3 memory to operate beyond the standard JEDEC SPD
specifi cation. Select XMP for 1600 MHz XMP memory operation and better system
performance. Otherwise, leave this setting at Auto.
High Performance Event Timer
Select Enabled to activate the High Performance Event Timer (HPET) that produces
periodic interrupts at a much higher frequency than a Real-time Clock (RTC) does in
synchronizing multimedia streams, providing smooth playback and reducing the de-
pendency on other timestamp calculation devices, such as an x86 RDTSC Instruc-
tion embedded in the CPU. The High Performance Event Timer is used to replace
the 8254 Programmable Interval Timer. The options are Enabled and Disabled.
Intel VT-d
Select Enabled to enable Intel's Virtualization Technology support for Direct I/O VT-d
by reporting the I/O device assignments to VMM through the DMAR ACPI Tables.
This feature offers fully-protected I/O resource-sharing across the Intel platforms,
7-11
Chapter 7: BIOS
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