HP DL380p G8: Maximum RAM Speed with 24x 32GB LRDIMMs

[yockl]

Hello all, 

I some questions regarding our two HP DL380p G8 server: 

1. Server 1 has 24x 32GB LRDIMMs (14900) with 2x Intel Xeon E5-2680V2
2. Server 2 has 24x 16GB RDIMMs (14900) with 2x Intel Xeon E5-2643V2

Currently server 1 is running with 1067 MHz clockspeed for RAM. I have checked the HPE online tool for RAM configuration. The tool says with our configuration we should be able to run with 1333 MHz instead of 1067 MHz. I´m not sure if this is correct or not?! Maybee anyone can answer us the qestion. 

My second question, is there a quite difference on performance betweeen the 1067 and 1333 MHz. We run a view Terminal Servers based on Windows on the server. 

On server 2 it is the same, the RAM speed is lower as the possible maximum supported by CPU and RAM. But I think this is normal when you use all 24 DIMMs, but on server 1 it is 800 MHz less what the memory can run. 

Thanks in advanced

[Paul_J_K]

Hi @yockl ,

I found the following information regarding the capabilities of DL380p Gen8 and I hope it helps you.

Maximum Capacity
(LRDIMM)
768GB (24 x 32GB LRDIMM @1066MHz)

Maximum Capacity
(RDIMM)
384GB (24x 16GB RDIMM @1333MHz)

Maximum Capacity
(UDIMM)
128GB (16 x 8GB UDIMM @1600MHz)

Maximum Capacity
(HDIMM)
768GB (24 x 32GB HDIMM @1333MHz)

Reference: https://h20195.www2.hpe.com/v2/getdocument.aspx?docname=c04123238

The main difference of the 1066 and 1333 will be the memory bandwidth and in a fully populated setup, there will be hardly any applications in general which will be able to take advantage of that bandwidth difference in my opinion. 

[yockl]

Hi Paul, 

okay understood now. Thank you very much for you fast help. 

Just as information: 

Maybee this should be corrected on the HP Memory Configuration page. As we have pruchased the RAM based on this tool. And I can confirm we have not checked the documentation it is also our fault  

Screenshot: https://my.cloud2trust.de/index.php/s/qeRX8QGmDEoeSBM