HP ProLiant SL165s Memory technology evolution: an overview of system memory t - Page 19

For more information

For additional information, refer to the resources listed below.

Resource description

Web address

JEDEC Web site

http://www.jedec.org

HP ProLiant Server Memory web page

http://h18004.www1.hp.com/products/servers/options/memory-

description.html

DDR3 memory technology, technology

brief

http://h20000.www2.hp.com/bc/docs/support/SupportManual

/c02126499/c02126499.pdf

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© Copyright 2010 Hewlett-Packard Development Company, L.P. The information contained herein

is subject to change without notice. The only warranties for HP products and services are set forth in

the express warranty statements accompanying such products and services. Nothing herein should

be construed as constituting an additional warranty. HP shall not be liable for technical or editorial

errors or omissions contained herein.

Intel, Intel Celeron, Itanium, Intel Itanium, Pentium, and Intel Xeon are trademarks of Intel

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AMD, AMD Athlon, AMD Opteron, AMD Virtualization, ATI HyperMemory, HyperTransport, PCnet,

and combinations thereof, are trademarks of Advanced Micro Devices, Inc.

TC101004TB, December 2010

Section	Page
Introduction	2
Basic DRAM operation	2
DRAM storage density and power consumption	4
Memory access time	4
System bus timing	4
Memory bus speed	5
Burst mode access	5
SDRAM technology	5
Bank interleaving	6
Increased bandwidth	6
Registered SDRAM modules	6
DIMM configurations	6
Single-sided and double-sided DIMMs	6
Single-rank, dual-rank, and quad-rank DIMMs	7
DIMM error detection/correction technologies	8
The increasing possibility of memory errors	8
Basic ECC memory	8
Advanced ECC memory	9
Memory protection technologies	10
Online Spare Memory mode	10
Mirrored Memory mode	11
Lockstep Memory mode	11
Memory protection mode summary	11
Advanced memory technologies	12
Rambus DRAM	12
Double Data Rate SDRAM technologies	12
DDR1	12
Prefetching	13
Double transition clocking	13
Stub-Series Terminated Logic_2 (SSTL_2) low-voltage signaling technology	13
Strobe-based data bus	13
DDR1 DIMMs	13
DDR2	13
DDR3	14
Module naming convention and peak bandwidth	14
Fully-buffered DIMMs	15
Importance of using HP-certified memory modules in ProLiant servers	18
Conclusion	18
For more information	19

HP ProLiant SL165s Memory technology evolution: an overview of system memory t - Page 19

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