Datasheet

10 Intel Desktop Board DQ45CB Specification Update
Table 3. Supported Memory Configurations
DIMM
Type
SDRAM
Technology
Smallest usable
DIMM (one x16
Single-sided
DIMM)
Largest usable
DIMM (one x8
Double-sided
DIMM)
Maximum capacity
with four identical
x8 Double-sided
DIMMs
DDR2 667 512 Mbit 256 MB 1 GB 4 GB
DDR2 667 1 Gbit 512 MB 2 GB 8 GB
DDR2 667 2 Gbit 1 GB 4 GB 16 GB
DDR2 800 512 Mbit 256 MB 1 GB 4 GB
DDR2 800 1 Gbit 512 MB 2 GB 8 GB
DDR2 800 2 Gbit 1 GB 4 GB 16 GB
2.1.1 Addressable Memory
The board utilizes 16 GB of addressable system memory. Typically the address space
that is allocated for PCI Conventional bus add-in cards, PCI Express configuration
space, BIOS (SPI Flash), and chipset overhead resides above the top of DRAM (total
system memory). On a system that has 16 GB of system memory installed, it is not
possible to use all of the installed memory due to system address space being
allocated for other system critical functions. These functions include the following:
• BIOS/ SPI Flash (32 Mbits)
• Local APIC (19 MB)
• Direct Media Interface (40 MB)
• Front side bus interrupts (17 MB)
• PCI Express configuration space (256 MB)
• GMCH base address registers, internal graphics ranges, PCI Express ports (up to
512 MB)
• Memory-mapped I/O that is dynamically allocated for PCI Conventional and PCI
Express add-in cards
• Base graphics memory support (1 MB or 8 MB)
• Intel
®
Management Engine Interface (Intel
®
MEI) single channel (8 MB) or dual
channel (16 MB)