Intel SC450NX - Server Platform - 0 MB RAM, Product Manual

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System memory begins at address 0 and is continuous (flat addressing) up to the maximum amount
of DRAM installed (exception: system memory is noncontiguous in the ranges defined as memory
holes using configuration registers). The system supports both base (conventional) and extended
memory.
•
Base memory is located at addresses 00000h to 9FFFFh (the first 1 MB).
•
Extended memory begins at address 0100000h (1 MB) and extends to FFFFFFFFh (4 GB),
which is the limit of supported addressable memory. The top of physical memory is a
maximum of 4 GB (to FFFFFFFFh).
✏
NOTE
Addressable memory can be extended to 64 GB under certain
configurations, but this server is configured to support 4 GB.
Some OSs and application programs use base memory while others use both conventional and
extended memory. Examples:
•
Base memory: MS-DOS
†
, OS/2
†
, Windows NT
†
, and UNIX
†
•
Conventional and extended memory: OS/2, Windows NT, and UNIX
MS-DOS does not use extended memory; however, some MS-DOS utility programs like RAM
disks, disk caches, print spoolers, and windowing environments use extended memory for better
performance.
BIOS automatically detects, sizes, and initializes the memory array, depending on the type, size,
and speed of the installed DIMMs, and reports memory size and allocation to the system via
configuration registers.
In a 4 GB configuration, a small part of memory (typically 32 MB) is not remapped above 4 GB.
If your OS does not support more than 4 GB of physical memory, this small part of the memory is
effectively lost.
✏
NOTE
DIMM sizes and compatibility: use DIMMs that have been tested for
compatibility with the baseboard. Contact your sales representative or
dealer for a list of approved DIMMs. The table below lists some sample size
combinations.
Table 4. Sample DIMM Component Combinations
Bank A (slots J1 - 4) Bank B (slots J5 - 8)
Bank C
(slots J9 - 12) Bank D
(slots J13 - 16)
Total Memory
4x32 128 MB
4x32 4x32 256 MB
4x32 4x32 4x32 4x32 512 MB
4x64 4x64 4x64 4x64 1024 MB
4x128 4x128 4x128 4x128 2048 MB