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ISS Technology Update

FB-DIMM options for lower power consumption

High memory capacity Intel® processor-based HP ProLiant servers have migrated toward high-speed, serial, Fully Buffered Dual

Inline Memory Module (FB-DIMM) technology, mainly because it delivers scalable bandwidth and memory capacity that is not

possible with traditional memory system architectures. The benefits of FB-DIMM technology also include simplified system board

design and improved reliability. To deliver these benefits, the FB-DIMM architecture uses point-to-point serial links to connect the

memory controller to an advanced memory buffer (AMB) chip that resides on each FB-DIMM.

The high-speed serial interface of the AMB causes the FB-DIMM to consume almost 5 Watts more than a typical registered

Double Data Rate 2 (DDR2) DIMM. The AMB power consumption also causes the FB-DIMM to get hotter; therefore, a heat

spreader is required to help draw heat away from the module (Figure 3-1). Notably, the energy consumption gap between FB-

DIMMs and DDR2 DIMMs decreases as the load on the memory subsystem increases because the power use of the AMB

doesn't increase significantly with demand.

To mitigate the power use and heat issues with standard FB-DIMMs, HP has launched lower-power FB-DIMMs that use between

10 and 20 percent less power at the same memory density. Of course, the actual power savings will be based on the system

configuration and work load. However, the percentage of savings should be fairly constant for a given system.

Another option to decrease the memory subsystem power consumption is to use fewer FB-DIMMs of higher capacity. For

example, replacing four 2-GB FB-DIMMs with two 4-GB DIMMs will basically eliminate the power use and heat generation of

two AMBs. Additional power savings are realized because the DRAM power consumption from one 4-GB FB-DIMM is less than

the DRAM power consumption from two 2-GB FB-DIMMs. The total power savings, while quite significant, will vary based on

system configuration and work load.

Figure 3-1. FB-DIMM with full module heat spreader

Additional resources

For additional information on the topics discussed in this article, visit the following link:

Resource

"Fully-Buffered DIMM technology in

HP ProLiant servers" technology

brief

Power calculator for HP ProLiant

servers that support FB-DIMMs

URL

http://h18004.www1.hp.com/products/servers/technology/white

papers/adv-technology.html#mem

http://h30099.www3.hp.com/configurator/calc/Power%20Calcul

ator%20Catalog.xls

Volume 7, Number 1