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Tomcat i7221A S5151
keeping as much of this information as possible in SRAM, the computer avoids accessing the
slower DRAM.
Enabled / Disabled
CPU L3 Cache
This BIOS feature controls the functionality of the processor's Level 3 cache.
When enabled, the processor's Level 3 cache will be allowed to function. This allows the best
possible performance from the processor.
When disabled, the processor's Level 3 cache will be disabled. The processor will bypass the
Level 3 cache and rely only on the Level 1 and Level 2 caches. This reduces the performance
of the processor.
The recommended setting is Enabled since disabling it severely affects the processor's
performance. However, the Disabled setting is useful as a troubleshooting tool, especially
when over clocking your processor.
Enabled / Disabled
Hyper-Threading Technology
This option allows you to enable or disable H yper-Threading Technology. Hyper-Threading
Technology is a form of simultaneous multi-threading technology (SMT) where multiple
threads of software applications can be run simultaneously on one processor. This is achieved
by duplicating the architectural state on each processor, while sharing one set of processor
execution resources. Hyper-Threading Technology also delivers faster r e sponse times for
multi-tasking workload environments. By allowing the processor to use on-die resources that
would otherwise have been idle, Hyper- Threading Technology provides a performance boost
on multi-threading and multi-tasking operations.
Enabled / Disabled
APIC Mode
This option allows you to enable or disable A dvanced Programmable
Interrupt Controller (APIC) Mode. APIC mode provides multi-processor interrupt management
and incorporates both static and dynamic symmetric interrupt distribution across all
processors. In systems with multiple I/O subsystems, each subsystem can have its own set of
interrupts. Each interrupt pin is individually programmable as either edge or level triggered.
The interrupt vector and interrupt steering information can be specified per interrupt. An
indirect register a ccessing scheme optimizes the memory space needed to access the I/O
APIC's internal registers. To increase system flexibility when assigning memory space usage,
the I/O APIC's two -register memory space is re-locatable.
Enabled / Disabled
Once the operating system is installed, such as Windows 2003, this
setting cannot be changed without reinstalling the operating system,
regardless of whether the initial setting is Disabled or Enabled.
MPS Version Control For OS
This feature is only applicable to multiprocessor motherboards as it specifies the version of the
Multi-Processor Specification (MPS) that the motherboard will use. The MPS is a specification
by which PC manufacturers design and build Intel architecture systems with two or more
processors.
MPS 1.1 was the original specification. MPS version 1.4 adds extended configuration tables
for improved support of multiple PCI bus configurations and greater expandability in the future.
In addition, MPS 1.4 introduces support for a secondary PCI bus without requiring a PCI
bridge.
1.1 / 1.4
Note
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Chapter 3: BIOS Setup
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