UCS-C200-M2 Memory Questions

[michael-luo]

I was trying to understand the description in the picture below.

Question #1: Are the part numbers below is for a single piece of memory stick?  Or it could be multiple pieces?

Question #2: If they are for a single piece, why 8GB would have the same price as 4GB?  e.g. N01-M308GB2-L is 8GB with $435.  N01-M304GB1-L is 4GB with $435.

Question #3: What does "dual rank", "single rank" and "quad rank" mean?  Why does it matter?

Question #4: What does "1Gb DRAMs", "2Gb DRAMs" mean?  Why does it matter?

Question #5: Can we mix memory sticks with different sizes (4GB and 8GB)?  If yes, what are the valid combinations?

Thanks!

[padramas]

Michael,

My thoughts inline

Question #1: Are the part numbers below is for a single piece of memory stick?  Or it could be multiple pieces?

*** Single memory module

Question  #2: If they are for a single piece, why 8GB would have the same price  as 4GB?  e.g. N01-M308GB2-L is 8GB with $435.  N01-M304GB1-L is 4GB with  $435.

*** I am not sure but curious to know if the above price list is from Cisco ordering tool or not ? 

Question #3: What does "dual rank", "single rank" and "quad rank" mean?  Why does it matter?

*** Following articles provides good explanation on it

http://www.dataram.com/blog/?p=32

http://en.wikipedia.org/wiki/Memory_rank

Question #4: What does "1Gb DRAMs", "2Gb DRAMs" mean?  Why does it matter?

*** Memory denisty of each DRAM chip on the DIMM module

Question #5: Can we mix memory sticks with different sizes (4GB and 8GB)?  If yes, what are the valid combinations?

Yes. Please following link that provides detailed information on memory population guidleines.

http://www.cisco.com/en/US/prod/collateral/ps10265/ps10493/spec_sheet_c17-644230.pdf

Only last three memory modules in the above picture is supported on C200 server.

Padma

[michael-luo]

Thank you very much for the detailed info.  +5

Michael

[padramas]

Michael,

To add further, server models that uses Extended Memory technology ( ex B250 ) have strict memory population requirements. For those servers, DIMMs are sold in pair and have to be replaced together.

Padma