For 16GB memory modules use at 1 DPC and 2 DPC
If the memory you need is going to require 1 DPC, or 2 DPC, you are better off buying the HP Smart Memory RDIMMs.
The 1600MHz HP Smart Memory RDIMMs will give you these speeds:
- 1 DPC at 1600MHz at 1.5V
- 2 DPC at 1600MHz at 1.5V
- 3 DPC at 1066MHz at 1.5V
If you use the low-voltage (1.35V) 1333MHz HP Smart Memory RDIMMs:
- 1 DPC at 1333MHz at 1.35V
- 2 DPC at 1333MHz at 1.35V
- 3 DPC at 1066MHz at 1.35V
UPDATE: 05/31/2012 – corrected 1600MHz to 1333MHz
Therefore you do not get above 1066MHz at 3 DPC (a speed grade slowdown). This is caused by memory loading.
For 16GB memory modules use at 3 DPC (virtualization/cloud computing/data centers)
If you need to use 3 DPC (or are planning to upgrade to that later) – you can buy HP Smart Memory HyperCloud (Netlist HyperCloud):
- 3 DPC at 1333MHz at 1.5V
This is available on the high volume virtualization/data center servers:
- HP DL360p
- HP DL380p
16GB HCDIMM Available on HP ProLiant DL360p and DL380p Gen8 Servers
May 15, 2012
HyperCloud memory is available to order on the DL360p and DL380p Gen8 servers. Click on the following links for DL360p and DL380p information:
What about 16GB LRDIMM ?
16GB LRDIMMs are not an option because they underperform even the 16GB RDIMMs (2-rank):
- 16GB LRDIMMs can only do 3 DPC at 1066MHz (so why buy the LRDIMM)
- 16GB LRDIMMs have higher latency issues (so why buy the LRDIMM)
HP/Samsung at the IDF conference on LRDIMMs video (Inphi LRDIMM blog) have said they will not be pushing 16GB LRDIMMs (because it cannot compete against the 16GB RDIMM 2-rank). However they would push the 32GB LRDIMMs because they have some utility vs. 32GB RDIMMs (which will only be available in 4-rank for a few years because 8Gbit DRAM die won’t be available for a while if ever).