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HP ProLiant DL360e Configuring and using DDR3 memory with HP ProLiant Gen8 Ser - Page 17

Number of DIMMs per channel and throughput, Using 8 x 16GB 2R 1600 RDIMMs at 1 DIMM per channel

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Figure 8: Throughput at different DIMM speeds with 1 DIMM per channel using 16GB 1600 RDIMMs. Memory throughput as a function of Memory Speed (Using 8 x 16GB 2R 1600 RDIMMs at 1 DIMM per channel) 100 90 80 70 60 50 GB/s Throughput 40 30 20 10 0 800 MT/s 1066 MT/s 1333 MT/s 1600 MT/s Number of DIMMs per channel and throughput Figure 9 shows the measured memory throughput for several one and two DIMM per channel configurations. Throughput actually decreases when a 2nd DIMM is added to each channel. With 2 DIMMs per channel installed, the memory controllers use more of the command bus bandwidth issuing refresh cycles to the additional ranks on each channel. This reduces the command bus bandwidth that is available to issue read and write requests and thus causes a reduction in overall throughput. Application workloads that are more sensitive to memory capacity than throughput will still benefit from the 2nd DIMM on each channel. 17

Section	Page
Introduction	3
Overview of DDR3 memory technology	3
Basics of DDR3 memory technology	3
DDR3 Memory Technology	3
DDR3 Speeds	3
Basics of DIMMs	4
DRAM technology	4
Ranks	4
Speed	4
DDR3 DIMM types	5
Unbuffered DIMMs	5
Registered DIMMs	5
Load Reduced DIMMs	5
HP SmartMemory	6
HP Advanced Memory Error Detection	6
ProLiant Gen8 memory architecture and DDR3 Memory	7
ProLiant Gen8 memory Architecture	7
HP ProLiant Gen8 Servers	8
HP ProLiant Gen8 Processors	8
DDR3 memory for HP ProLiant Gen8 servers	9
Populating memory in HP ProLiant Gen8 servers	10
HP ProLiant Gen8 memory slot configurations	10
Population rules for HP ProLiant Gen8 servers	10
Rules for populating processors and DIMM slots	10
Rules for DIMM types	10
General rules	11
DIMM Population Order	11
Memory system operating speeds	12
Mixing DIMM speeds and DIMMs/channel	13
General population guidelines	13
Optimizing memory configurations	13
Optimizing for capacity	13
Optimizing for performance	14
Factors influencing latency	14
Factors influencing memory throughput	15
Number of memory channels and throughput	15
Memory speed and throughput	16
Number of DIMMs per channel and throughput	17
Mixing DIMM sizes	19
General guidelines	19
Optimizing for lowest power consumption	19
DIMM types and power consumption	19
Memory speed and power consumption	20
General guidelines when optimizing for power consumption	21
Optimizing for Resiliency	21
Understanding unbalanced memory configurations	22
0TMemory configurations that are unbalanced across channels	22
0TMemory configurations that are unbalanced across Processors	22
BIOS Settings for memory	23
Controlling Memory Speed	23
Setting Maximum Memory Bus Frequency	23
Setting Memory Interleave	24
Diasabling Memory Interleaving	24
Setting Node Interleaving	24
For more information	25
Appendix A	26
Sample Configurations for 2P ProLiant Gen8 servers	26
24 DIMM slot servers	26

Match case Limit results 1 per page

Figure 8:

Throughput at different DIMM speeds with 1 DIMM per channel using 16GB 1600 RDIMMs.

Number of DIMMs per channel and throughput

Figure 9 shows the measured memory throughput for several one and two DIMM per channel

configurations. Throughput actually decreases when a 2

DIMM is added to each channel. With 2 DIMMs

per channel installed, the memory controllers use more of the command bus bandwidth issuing refresh

cycles to the additional ranks on each channel. This reduces the command bus bandwidth that is available

to issue read and write requests and thus causes a reduction in overall throughput. Application workloads

that are more sensitive to memory capacity than throughput will still benefit from the 2

DIMM on each

channel.

100

800 MT/s

1066 MT/s

1333 MT/s

1600 MT/s

Memory throughput as a function of Memory Speed

(Using 8 x 16GB 2R 1600 RDIMMs at 1 DIMM per channel)

GB/s Throughput