Cisco UCS B200 M2 Specifications page 27

When considering the memory configuration of your server, you should observe the following:
DIMMs within the blade server should all be the same type. This goes for both speed and
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size. Do not mix different sized DIMMs or DIMMs with different clock rates in the same blade
server. Doing so will cause a significant loss of performance.
Your selected CPU(s) can have some effect on performance.
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DIMMs can be run in a 1 DIMM per channel or a two DIMM per channel configuration. Each of
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these arrangements can provide different behavior.
Cisco UCS B200 M2 Blade Server
SUPPLEMENTAL MATERIAL
27