Sizes of mixed memory in Dell R710 to reach speeds of 1333 mhz and 800 mhz

We have some Dell R710 which was originally ordered with 48 GB in a configuration of 1333 mhz 12x4Go (RDIMMS). We ordered 6 sticks of memory of 4 GB 1333 mhz additional to complete all 18 banks for a total of 72 GB.  The speed of the memory, then decreased to running at 800 mhz.  We had immediately complaints on the performance in some of our mission critical VM (terminal Server and SQL DBs servers), so we have VMotion their due on a R710 still on the original 12x4Go config clocked at 1333 mhz and complaints went.  I spoke with pre-sales both Dell and after-sales technical support and they confirm that filling all 18 banks decreases speed to 800 mhz, but I get conflicting reports which must be running 12 banks (which is configured as 2 of the 3 banks available in each 6 channels) at 1 066 mhz now which is not. Still, both say that my best option is to return the modules to 4 GB bought recently and also pull the original 12x4Go modules and replace them all by 12x8Go 96GB and should operate at 1333 mhz.  It is really more memory I need and almost three times that I have already budgeted and spent on extra 4 GB of purchase sticks.

The other option, you said I could do, as well as that of my question is to mix 6x4Go and 6X8Go, up to 72 GB.  I see also that is a configuration of memory available on the Dell Web site during the construction a R710, and he said 1333 mhz as well.  Technical support before and after had these things to say, and it makes me a little nervous because this isn't an absolute 'you'll be fine:

prior support guy:

"Everything I read or say confirms that it is perfectly fine to mix the modules in sizes too long as modules within each channel are the same size." I think it can be recommended by most to ensure the consistency of the size but as I said before that we have in our new server system configurations to be cited with mixed sizes what makes me even more confident that is you went this route you would be fine and little or no experience in performance decline. »

support after guy:

"Regarding your new question on the use of 6 DIMM 4 GB mixed with 8 GB for a total of 72 GB, which is not an optimum configuration, but I don't think you should really meet a lot of problems with it."  I mentioned before that if you mix speeds, it will downclock fastest at the speed of slow DIMM DIMMS, so certainly would advise against mixing speeds. Regarding the size, the only thing you might encounter as it is booting, you can hear this isn't an optimal configuration, but it should detect any memory and be able to make use of this.  Don't think there is really a performance reached unless you're missing speeds.  «Also, don't forget to reflect your configuration across all channels, if you do not want all of the 4 GB and 8 GB in the same configuration such that put all 8 GB in slots 1/2/3, then put the 4 GB DIMMs in 4/5/6 on both machines slot A and B.»

So the real question is - if it is not a "optimal" configuration, which makes it means the actual performance of my vSphere servers?  All done and they have problems?

Thank you

Ben

How about using 8x8GB sticks for each host? You'd get to 64 GB each... I'd like to see if Dell will allow you to trade in the memory, you do not have to purchase new memory inside the host... Or look for another provider of memory which will provide you with the correct memory at a better price.

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VMware VCP4

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