Reality Check: Server Insights
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HP DDR3 DIMMs break through the bandwidth barrier

By Jeff Fisher.  

If you've figured out the "typical" bandwidth speeds with the new DDR3 memory in all the new Intel-based Nehalem servers, you might recognize performance bandwidth tables like these;

DPC = DIMMs Per Channel

  • 1 DPC = 1333MHz

  • 2 DPC = 1066MHz  <-read below; at hp this is now also 1333MHz!

  • 3 DPC = 800MHz

Originally, only servers that installed one DDR3 DIMM per memory channel could reach speeds of 1333Mhz.  When two DDR3 DIMMS were installed in a memory channel, the fasted memory speeds that could be reached was 1066MHz.

Until now!

HP Engineers have designed an Hewlett-Packard exclusive method so that servers that have two DDR3 DIMMs per memory channel can reach speeds of 1333Mhz!

To add to this HP exclusive, HP just announced an 8GB DDR3 RDIMM that runs at 1333Mhz (previously the fastest 8GB DDR3 RDIMM was 1067MHz).  That new part number is 500662-B21.

So now, you may get the highest capacity DDR3 DIMMs (8GB) at the fast speed available (1333MHz) and populate your server with twice as much memory and still get that fastest speed (1333MHz)!

Of course there are going to be some restrictions, and system performance will vary depending on several factors (Server model, CPU capability, DIMM type and number of DIMM's populated), but this is a cool development.  The new performance is available from a simple ROM update via ROM Based Setup Utility (RBSU).

Check it out; even some of the industry writers have highlighted this:!

Labels: DDR3| memory

Nehalem is not the only thing new with G6...

By Jeff Fisher.  Nehalem is not the only thing new with G6; don’t forget the DDR3 memory!

All the talk about Intel’s new Nehalem processors (the Xeon 5500 series) leads one to maybe think that these new processors are all there is to faster server performance; but that’s not the only component of performance.  For years many have considered memory, not the processor, to have a greater impact on performance.  Intel says the new system is well-suited for virtualization, along the lines of a 160% increase in virtualization performance.  Intel also said (in the press) that the new addition to its Xeon line can more than double the computing performance of existing models at the same power consumption. Memory should never be considered “just memory”, and the above performance claims can’t be achieved without a lot of memory.  With an entirely new system architecture to start with, now is the perfect time to look at these new processors AND the DDR3 memory that works with them.  To reduce power, maximize virtualization and optimize your IT budget, buy the new ProLiant G6 servers and fill ‘em up with DDR3 memory!


Labels: DDR3| G6| memory

DDR3 Memory for G6 servers

Are you confused about the different kids of server memory out there and want to know more about the new DDR3 memory?  Did you know that low power memory can be part of your energy efficient environment?  Jeff Fisher explains all about DDR3 memory and different memory configurations in an easy to umderstand presentation; view the PowerPoint presentation and listen to the MP3 audio at

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