Hello.   Yes, I looked up and these memory modules are compatible with R320 server.   Now I have a 4x8GB RDIMM RAM Modules. I want to add 2x16GB RDIMM modules to two free slots.   Under the current memory configuration and populating the 2x 16GB memory modules to the remaining 2 slots may trigger memory errors during POST, prompting you to press F1/F2 key to continue; because the memory configuration is not optimal. Refer to the diagrammatic illustration below: [IMAGE] For optimal memory configuration, the memory modules on Channel 1, Channel 2 and Channel 3 have to be identical. Therefore, you will have the following configuration: A1 &A2 = 16GB and A4 & A5 = 8GB. Alternatively, you buy one 16GB memory module to add to Channel 3 hence A1, A2 &A3 = 16GB and A4, A5 &A6 = 8GB with total memory capacity of 72GB. For more information see pages 40 - 41 of the Users' Guide: [URL] 
Hi, i'm planned to upgrade memory in my r320 server. Now I have a 4x8GB RDIMM RAM Modules. I want to add 2x16GB RDIMM modules to two free slots. Modules with p/n 370-20147 are compatible? 
r320 memory upgrade