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).
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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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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Comparing RDIMMs, LRDIMMs and HCDIMMs/HDIMMs
UPDATE: 07/06/2012 – VMware certifies Netlist as sole memory vendor
Adding this as an entry point (or crash course) for folks asking about HCDIMMs and HDIMMs on twitter.
IBM HCDIMMs are Netlist HyperCloud.
HP HDIMMs are Netlist HyperCloud (called “HP Smart Memory HyperCloud”).
HP Smart Memory includes some other diagnostic/error features, and so that feature set has been extended to the HyperCloud and it is therefore also called a “HP Smart Memory”.
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For 32GB memory modules – the problem with 32GB RDIMMs
32GB RDIMM will only be available in 4-rank (4-rank).
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