Memory for C1100

Hello,

I will be glad to help.  With this system only supporting Optimized mode, you can fully populate all 18 slots if you’re using single rank or dual rank DIMMs. 

Thanks for the screen shots.  I do see that your current configuration is not installed in the most optimized balanced configuration as all channels should be balanced.  There are 3 sets of channels per CPU.  Meaning for CPU 0, you currently have 2 DIMMs per channel A0/A1, B0/B1, C0/C1.  However, for CPU 1, you only have 1 DIMM per channel D0, E0, F0.  It is recommend that all channels be balanced. 

Keeping budget in mind, your expansion options would be to ensure you order the exact DIMMs for ease of population and start with populating D1, E1, F1 to balance out what you currently have. This will get you 48 GB.

If needing more memory,  you can then scale up to fully populating the remaining 6 empty slots A3, B3, C3 – D3, E3, F3 which will give you a total of 72 GB.

In the future, if you need to more than 72 GB. You may go with mixed sizes starting with 6 larger 8 GB DIMMs in the first slot of each the 6 channels A0, B0, C0 – D0, E0, F0, then fill in the remaining 12 slots with the 4 GB DIMMs.

Here is a picture to help you with the physical layout.