HP ProLiant DL360e Configuring and using DDR3 memory with HP ProLiant Gen8 Ser - Page 13

Mixing DIMM speeds and DIMMs/channel, General population guidelines, Optimizing memory configurations

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Table 6: ProLiant Gen8 server memory operating speeds for different DIMM configurations RDIMMs Standard Voltage (1.5V) RDIMMs Low Voltage (1.35V) LRDIMMs Low Voltage (1.35V) UDIMMs Low Voltage (1.35V) 1 DIMM per channel 1600 MT/s 1333 MT/s 1333 MT/s 1333 MT/s 2 DIMMs per channel 3 DIMMs per channel 1600 MT/s 1066 MT/s 1333 MT/s 1066 MT/s 1333 MT/s 1066 MT/s 1333 MT/s Not Supported Mixing DIMM speeds and DIMMs/channel • Mixing DIMM speeds is allowed, but the system processor speed rules always override the DIMM capabilities. • When mixing DIMM speeds, the memory bus will default to the minimum clock rate of all DIMMs in the server. • Both processors will operate at the same memory clock rate. • If a DDR3-1333 DIMM is installed in channel 1 and a DDR3-1600 DIMM is installed in channel, the server will run at the lower data rate. • If a DDR3-1333 DIMM is installed in channel 1, and 7x DDR3-1600 DIMMs are installed in 1 DIMM per channel configuration in each of the remaining channels, the server will run at DDR3-1333. General population guidelines When configuring a 2P HP ProLiant Gen8 server, you can achieve a good balance between performance, power usage, and cost by following these general guidelines. • Populate all 4 channels of each processor (For 2 processor systems, this means populating in groups of 8 identical DIMMs). • Use the same HP SmartMemory part number in each memory channel. Optimizing memory configurations By taking advantage of the different DIMM types, sizes and speeds available for HP ProLiant Gen8 servers, you can optimize server memory configuration to meet different application or datacenter requirements. Optimizing for capacity You can maximize memory capacity on HP ProLiant Gen8 servers using the new 32 GB LRDIMMs. LRDIMMs allow you to install 3 quad-ranked DIMMs in a memory channel, something that was not possible with earlier G6 or G7 ProLiant servers. By populating all 24 slots, you can configure Gen8 2P servers with up to 768 GB of total memory. Table 7 shows the maximum memory capacities possible for both 16 DIMM slot and 24 DIMM slot Gen8 servers using each of the 3 DIMM types. 13

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Table 6:
ProLiant Gen8 server memory operating speeds for different DIMM configurations
RDIMMs
Standard Voltage
(1.5V)
RDIMMs
Low Voltage
(1.35V)
LRDIMMs
Low Voltage
(1.35V)
UDIMMs
Low Voltage
(1.35V)
1 DIMM per
channel
1600 MT/s
1333 MT/s
1333 MT/s
1333 MT/s
2 DIMMs per
channel
1600 MT/s
1333 MT/s
1333 MT/s
1333 MT/s
3 DIMMs per
channel
1066 MT/s
1066 MT/s
1066 MT/s
Not Supported
Mixing DIMM speeds and DIMMs/channel
•
•
Mixing DIMM speeds is allowed, but the system processor speed rules always override the DIMM
capabilities.
•
When mixing DIMM speeds, the memory bus will default to the minimum clock rate of all DIMMs in the
server.
•
Both processors will operate at the same memory clock rate.
•
If a DDR3-1333 DIMM is installed in channel 1 and a DDR3-1600 DIMM is installed in channel, the
server will run at the lower data rate.
General population guidelines
If a DDR3-1333 DIMM is installed in channel 1, and 7x DDR3-1600 DIMMs are installed in 1 DIMM per
channel configuration in each of the remaining channels, the server will run at DDR3-1333.
When configuring a 2P HP ProLiant Gen8 server, you can achieve a good balance between performance,
power usage, and cost by following these general guidelines.
•
Populate all 4 channels of each processor (For 2 processor systems, this means populating in groups of
8 identical DIMMs).
•
Optimizing memory configurations
Use the same HP SmartMemory part number in each memory channel.
By taking advantage of the different DIMM types, sizes and speeds available for HP ProLiant Gen8
servers, you can optimize server memory configuration to meet different application or datacenter
requirements.
Optimizing for capacity
You can maximize memory capacity on HP ProLiant Gen8 servers using the new 32 GB LRDIMMs.
LRDIMMs allow you to install 3 quad-ranked DIMMs in a memory channel, something that was not possible
with earlier G6 or G7 ProLiant servers. By populating all 24 slots, you can configure Gen8 2P servers with
up to 768 GB of total memory.
Table 7 shows the maximum memory capacities possible for both 16 DIMM slot and 24 DIMM slot Gen8
servers using each of the 3 DIMM types.