MSI K9NU User Guide - Page 41

BIOS Setup, Fan Type Control, IOMMU, System Information

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BIOS Setup ing to update the BIOS with a Flash utility. To successfully update the BIOS, you'll need to disable this BIOS W rite Protect function. You should enable this function at all times. The only time when you need to disable it is when you want to update the BIOS. After updating the BIOS, you should immediately re-enable it to protect it against viruses. Fan Type Control This setting allows you to select the fan type (3-pin or 4-pin) for fan power management. IOM M U AMD64, one of the 64-bit architectures, contains a device called the IOMMU (Input/ Output Memory Management Unit). The IOMMU allows 32-bit devices to see all of the (64-bit addressed) main memory although with a 32-bit address bus you can only address a 32-bit address space. It is an MMU that translates DMA virtual addresses to real physical addresses. Size This setting specifies the memory size for IOMMU. System Information This sub-menu shows the system hardware information. 3-7

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3-7
BIOS Setup
ing to update the BIOS with a Flash utility. To successfully update the BIOS, you
’
ll
need to disable this BIOS Write Protect function.
You should enable this function at all times. The only time when you need to disable
it is when you want to update the BIOS. After updating the BIOS, you should immedi-
ately re-enable it to protect it against viruses.
Fan Type Control
This setting allows you to select the fan type (3-pin or 4-pin) for fan power
management.
IOMMU
AMD64, one of the 64-bit architectures, contains a device called the IOMMU (Input/
Output Memory Management Unit). The IOMMU allows 32-bit devices to see all of the
(64-bit addressed) main memory although with a 32-bit address bus you can only
address a 32-bit address space. It is an MMU that translates DMA virtual addresses
to real physical addresses.
Size
This setting specifies the memory size for IOMMU.
System Information
This sub-menu shows the system hardware information.