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ShishirDash5204
Beginner

UCS B200 M5 memory selection

I have a requirement for B200 M5 server.

Total CPU count:

CPU Distribution of 6 servers(CPU Socket * Cores * Threads):

 (4*10*2*6)=480 CPUs

CPU Distribution of 8 servers(CPU Socket * Cores * Threads):

(4*8*2*8)=512 CPUs

Total Memory-5376 GB

Shall I assume a CPU with 40 core per server? 

What would be the memory recommendation and count?

1 ACCEPTED SOLUTION

Accepted Solutions
Kirk J
Cisco Employee

https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-b-series-blade-servers/b200m5-specsheet.pdf

shows your 20+ core per CPU options.

https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-c-series-rack-servers/memory-guide-c220-c240-b200-m5.pdf  list "When populating DIMM slots for optimal performance, multiples of 12 DIMMs are best
because there are 6 memory channels per CPU socket and 2 CPUs must be populated."

Probably 12x64GB (or 24x 32GB) DIMM modules per server would provide more than the required Total Memory-5376 GB, but going with other configs to hit lower memory total population would take a performance hit if you don't stick with the multiple of 12 dimms.

 

Kirk...

 

View solution in original post

2 REPLIES 2
Kirk J
Cisco Employee

https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-b-series-blade-servers/b200m5-specsheet.pdf

shows your 20+ core per CPU options.

https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-c-series-rack-servers/memory-guide-c220-c240-b200-m5.pdf  list "When populating DIMM slots for optimal performance, multiples of 12 DIMMs are best
because there are 6 memory channels per CPU socket and 2 CPUs must be populated."

Probably 12x64GB (or 24x 32GB) DIMM modules per server would provide more than the required Total Memory-5376 GB, but going with other configs to hit lower memory total population would take a performance hit if you don't stick with the multiple of 12 dimms.

 

Kirk...

 

View solution in original post

Agreed. What would be the difference of choosing UCS-CPU I6248R over UCS CPU -I6248 except for the number of cores?

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