Intel SC450NX Product Guide - Page 23

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 C Bank A (slots J1 - 4) Bank B (slots J5 - 8) (slots J9 - 12) 4x32 4x32 4x32 4x64 4x128 4x32 4x32 4x64 4x128 4x32 4x64 4x128 Bank D (slots J13 - 16) 4x32 4x64 4x128 Total Memory 128 MB 256 MB 512 MB 1024 MB 2048 MB 23