Intel S5520SC Specifikace stáhnout pdf (Strana 42)

Functional Architecture Intel® Workstation Board S5520SC TPS

Revision 1.7

Intel order number: E39530-010

3.3.4 Publishing System Memory

z The BIOS displays the “Total Memory” of the system during POST if Quiet Boot is

disabled in the BIOS Setup. This is the total size of memory discovered by the BIOS

during POST, and is the sum of the individual sizes of installed DDR3 DIMMs in the

system.

z The BIOS also provides the total memory of the system in the BIOS setup (Main

page and Advanced | Memory Configuration Page). This total is the same as the

amount described by the previous bullet.

z The BIOS displays the “Effective Memory” of the system in the BIOS Setup

(Advanced | Memory Configuration Page). The term Effective Memory refers to the

total size of all active DDR3 DIMMs (not disabled) and not being used as redundant

units in Mirrored Channel Mode.

z If Quiet Boot is disabled, the BIOS displays the total system memory on the

diagnostic screen at the end of POST. This total is the same as the amount

described by the first bullet.

3.3.4.1 Memory Reservation for Memory-mapped Functions

A region of size 40 MB of memory below 4 GB is always reserved for mapping chipset,

processor, and BIOS (flash) spaces as memory-mapped I/O regions. This region appears as a

loss of memory to the operating system.

This (and other) reserved regions are reclaimed by the operating system if PAE is enabled in

the operating system.

In addition to this memory reservation, the BIOS creates another reserved region for memory-

mapped PCI Express* functions, including a standard 64 MB or 256 MB of standard PC Express

MMIO configuration space. This is based on the setup selection “Maximize Memory below 4GB”.

If this is set to “Enabled”, the BIOS maximizes usage of memory below 4 GB, for an operating

system without PAE capability, by limiting PCI Express* Extended Configuration Space to 64

buses, rather that the standard 256 buses.

3.3.4.2 High-Memory Reclaim

When 4 GB or more of physical memory is installed (physical memory is the memory installed

as DDR3 DIMMs), the reserved memory is lost. However, the Intel

5500/5520 I/O Hub provides

a feature called high-memory reclaim, which allows the BIOS and the operating system to

remap the lost physical memory into system memory above 4 GB (the system memory is the

memory the processor can see).

The BIOS always enables high-memory reclaim if it discovers installed physical memory equal

to or greater than 4 GB. For the operating system, you can recover the reclaimed memory only

if the PAE feature in the processor is supported and enabled. Most operating systems support

this feature. For details, refer to the relevant operating system’s manuals.

3.3.5 Memory Interleaving

The Intel

Xeon

Processor 5500 Series supports the following memory interleaving mode:

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 191 192

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Intel S5520SC Specifikace Strana 42

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