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.
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: http://blog.scottlowe.org/2009/04/07/hps-proliant-g6-servers/!
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!
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 http://hpbroadband.com/program.aspx?key=PLQQSKDIKL.
By Jeff Fisher
Some third party vendors offer lifetime warranties and sometimes Wal-mart like prices - they would very clearly like to sell as many dimms as possible, to as many customers as possible. It is far less costly for them to offer a free replacement dimm when something goes wrong, rather than do what HP does from the start - provide reliable, quality products. It's a simple volume/numbers game.
HP memory joins the warranty of the server. That is clearly less than "lifetime," but the HP memory is part of the HP ProLiant solution that was created from the beginning, which is the reason customers make HP #1 in the world. HP authorized vendors are screened and evaluated before they even submit parts for qualification. Strict thresholds must be passed before any dimm becomes an HP DIMM.
What can possibly vary, or be different in a DIMM? Up to six major suppliers make the "same" thing, but each is actually different; fabrication facility, processes, die size, DRAM configuration (1R/2R/4R), data width (x4, x8), technology (512Mb-based, 1Gb, 2Gb), raw cards, register/PLL's, heat spreaders, CAS latency, clock speed, wattage, voltage and more. Each recipe can be different, and the combinations are staggering. HP requires all the parts to come together in the proper mix, for the DIMM itself AND for how it works inside each ProLiant - before it becomes an HP DIMM. Fully integrated, compatible and reliable HP Qualified Options are warrantied to work with the rest of the ProLiant solution. If something does go wrong, you may end up with a new dimm if applicable, but you'll also get the support of the full solution to determine exactly what might be wrong, and make the solution return to full functionality. Making all the intricacies of memory technology operate seamlessly and do what they do, for literally just pennies per megabyte, very nearly IS rocket science.