HP Dl180 Fully-Buffered DIMM technology in HP ProLiant servers

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  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 1
    ProLiant servers technology brief Abstract...2 Introduction...2 Performance barriers for traditional DIMM 2 Fully-Buffered DIMM architecture ...4 Benefits...6 Simplified board design ...6 Higher memory capacity ...6 Higher performance...7 Improved reliability...7 Challenges ...8 Latency ...8 Power
  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 2
    FB-DIMM slots to achieve maximum performance in HP ProLiant servers. Introduction HP ProLiant servers provide balanced system architectures that deliver peak performance per watt of power. A balanced system architecture is one in which the three main server subsystems-processing, memory, and
  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 3
    density. For future generations of high-performance servers, neither option was acceptable. Future generations of servers require an improved memory architecture to achieve higher memory bandwidth and capacity. Consequently, JEDEC3 developed the Fully-Buffered DIMM specification, a serial interface
  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 4
    Fully-Buffered DIMM architecture The FB-DIMM architecture has serial links between the memory controller and the FB-DIMMs, which are connected in a daisy chain configuration (Figure 3). Relative to the memory controller, there are 10 outbound links and 14 inbound links, also known as southbound and
  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 5
    operation, the AMB serializes data from the DRAM devices and transmits it to the memory controller through the inbound links. Inbound and the FB-DIMM, the peak theoretical throughput of both the DRAM devices and the inbound links is 4.3 GB/sec. Each outbound frame is 120 bits (15 bytes) long
  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 6
    traces do not add to overall routing complexity. In addition, the memory controller and AMB can compensate for signal traces of unequal length, thus to Memory technology evolution: an overview of system memory technologies technology brief at http://h18004.www1.hp.com/products/servers/technology/
  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 7
    memory controller and AMB enable higher performance by the memory subsystem. The two devices operate on independent clocks, so the transmitting device devices, the outbound links have a theoretical throughput of 2.1 GB/sec, or approximately one-half of 4.3-GB could disrupt server performance and
  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 8
    time the memory controller receives the first frame of read data. Because the FB-DIMM architecture is based on server's internal fans. To estimate the power consumption for all current HP ProLiant servers that support FB-DIMMs, use the power calculators at http://www.hp.com/configurator/calc/Power
  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 9
    . This has the added benefit of using less power per GB of memory. Also, when configuring memory, keep the channels balanced to minimize the latency per channel-latency increases with each additional set of FB-DIMMs. Conclusion HP supports the FB-DIMM standard because it increases reliability
  • HP Dl180 | Fully-Buffered DIMM technology in HP ProLiant servers - Page 10
    Hyperlink JEDEC Web site http://www.jedec.org HP Advanced Memory Protection Memory technology evolution http://h18004.www1.hp.com/products/servers/technology/whitepapers/advtechnology.html http://h18004.www1.hp.com/products/servers/technology/whitepapers/advtechnology.html Call to action Send
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Fully-Buffered DIMM technology in HP ProLiant servers
technology brief
Abstract
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2
Introduction
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2
Performance barriers for traditional DIMM
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2
Fully-Buffered DIMM architecture
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4
Benefits
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6
Simplified board design
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6
Higher memory capacity
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6
Higher performance
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7
Improved reliability
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7
Challenges
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8
Latency
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8
Power and thermal loads
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8
Performance tuning, achieving maximum performance
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9
Conclusion
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9
For more information
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10
Call to action
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10