Tag Archives: UCS

Memory choices for Cisco UCS B200 M3 Blade Server (Romley)

This server has 24 DIMM slots for a total of 384GB (using 16GB RDIMMs).

However I cannot find any docs outlining the speeds achievable at 1 DPC, 2 DPC, 3 DPC (as are available from IBM and others).

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LRDIMM latency vs. DDR4

UPDATE: 06/24/2012: Invensas on LRDIMM design inferiority vs. HyperCloud
UPDATE: 07/27/2012 – confirmed HCDIMM similar latency as RDIMMs
UPDATE: 07/27/2012 – confirmed LRDIMM latency and throughput weakness

RDIMMs have a 1 cycle latency compared to UDIMMs (unregistered DIMMs).

LRDIMMs have a “5 ns latency penalty” compared to RDIMMs (from Inphi LRDIMM blog).

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