Intel BLKD865GLCLK Product Specification - Page 60
there is no overlap of system addresses.
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Intel Desktop Board D865GBF/D865GLC Technical Product Specification program will further reduce the amount of memory available to the operating system. Figure 17 shows a schematic of the system memory map. All installed system memory can be used when there is no overlap of system addresses. For example, all of the system address space can be utilized on a system that has 2 GB of installed system memory, AGP aperture set for 256 MB, and the PCI cards are requesting 200 MB of system address space. DRAM Range 4 GB Top of System Address Space PCI Memory Range (Contains AGP window, GFX aperture, PCI, and ICH ranges) FLASH APIC Reserved ~20 MB Video Frame Buffer Top of installed DRAM Top of usable DRAM (memory visible to the operating system) DOS Compatibility Memory 1 MB 640 KB 0 MB 0FFFFFH 0F0000H 0EFFFFH 0E0000H 0DFFFFH 0C0000H 0BFFFFH 0A0000H 09FFFFH 00000H Upper BIOS area (64 KB) Lower BIOS area (64 KB; 16 KB x 4) Add-in Card BIOS and Buffer area (128 KB; 16 KB x 8) Standard PCI/ ISA Video Memory (SMM Memory) 128 KB * DOS area (640 KB) 1 MB 960 KB 896 KB 768 KB 640 KB 0 KB * Optionally mapped to the internal AGP OM15972 Figure 17. Detailed System Memory Address Map 60