Intel SE7520JR2 3.3Memory Sub-System, 3.3.1Memory Sizing

Intel® Server Board SE7520JR2 Functional Architecture

The ICH5-R supports slave functionality, including the Host Notify protocol. Hence, the host controller supports eight command protocols of the SMBus interface: Quick Command, Send Byte, Receive Byte, Write Byte/Word, Read Byte/Word, Process Call, Block Read/Write, and Host Notify. See the System Management Bus (SMBus) Specification, Version 2.0 for more information.

3.3Memory Sub-System

The MCH provides an integrated memory controller for direct connection to two channels of registered DDR-266, DDR-333 or DDR2-400 memory (stacked or unstacked). Peak theoretical memory data bandwidth using DDR266 technology is 4.26 GB/s and 5.33 GB/S for DDR333 technology. For DDR2-400 technology, this increases to 6.4 GB/s

The MCH supports a burst length of four, whether in single or dual channel mode. In dual channel mode this results in eight 64-bit chunks (64-byte cache line) from a single read or write. In single channel mode, two reads or writes are required to access a cache line of data.

3.3.1Memory Sizing

The memory controller is capable of supporting up to 4 loads per channel for DDR-333 and DDR2-400. Memory technologies are classified as being either single rank or dual rank depending on the number of DRAM devices that are used on any one DIMM. A single rank DIMM is a single load device, ie) Single Rank = 1 Load. Dual rank DIMMs are dual load devices, ie) Dual Rank = 2 loads.

The Server Board SE7520JR2 provides the following maximum memory capacities based on the number of DIMM slots provided and maximum supported memory loads by the chipset:

•24GB maximum capacity for DDR-266

•16GB maximum capacity for DDR-333 and DDR2-400

The minimum memory supported with the system running in single channel memory mode is:

•256MB for DDR-266, DDR-333 and DDR2-400

Supported DIMM capacities are as follows:

•DDR-266 Memory DIMM sizes include: 256MB, 512MB, 1GB, 2GB, and 4GB.

•DDR-333 Memory DIMM sizes include: 256MB, 512MB, 1GB, 2GB, and 4GB.

•DDR2-400 Memory DIMM sizes include: 256MB, 512MB, 1GB, 2GB, and 4GB.

DIMM Module Capacities:

	SDRAM Parts / SDRAM Technology Used	128Mb	256Mb	512Mb	1Gb
	X8, single row	128MB	256MB	512MB	1GB
Revision 1.0					37

C78844-002