301467-005 Datasheet, PDF (227/426 Pages) Intel Corporation – Express Chipset

Functional Description
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12.3.1
12.3.1.1
DRAM Technologies and Organization
All standard 256-Mb, 512-Mb, and 1-Gb technologies and addressing are supported for x16 and
x8 devices.
• All supported DDR devices have 4 banks; all supported DDR2 devices have 4 or 8 banks.
• The (G)MCH supports various page sizes. Page size is individually selected for every rank.
• 4 KB, 8 KB, and 16 KB for asymmetric, interleaved, or single-channel modes.
• The DRAM sub-system supports single or dual channels, 64-b wide per channel.
• There can be a maximum of four ranks populated (two double-sided DIMMs) per channel.
• Mixed mode double-sided DIMMs (x8 and x16 on the same DIMM) are not supported
• By using 1-Gb technology, the largest memory capacity is 8 GB
32M rows/bank * 4 banks/device * 8 columns * 8 devices/rank * 4 ranks/channel *
2 channel * 1b/(row*column) * 1G/1024M * 1B/8b = 8 GB.
Though it is possible to put 8 GB in system by stuffing both channels this way, the (G)MCH
is still limited to 4 GB of addressable space due to the number of address pins on the FSB.
• By using 256-Mb technology, the smallest memory capacity is 128 MB
(4M rows/bank * 4banks/device * 16 columns * 4 devices/rank * 1 rank * 1B/8b =128 MB)
Rules for Populating DIMM Slots
• In all modes, the frequency of system memory will be the lowest frequency of all DIMMs in
the system, as determined through the SPD registers on the DIMMs.
• In the Single Channel mode, any DIMM slot within the channel may be populated in any
order. Either channel may be used. To save power, do not populate the unused channel.
• In Dual-Channel Asymmetric mode, any DIMM slot may be populated in any order.
• In Dual-Channel Interleaved mode, any DIMM slot may be populated in any order, but the
total memory in each channel must be the same.
Datasheet
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