VMware vSphere

 View Only

  • 1.  Does memory speed matter (DDR3-1333 or DDR3-1066)?

    Posted Apr 15, 2015 06:18 AM

    Hello,

    We have Dell R720 with 192Gb of RAM.

    There are 108 GB of DDR3-1333 and other of DDR3-1066.

    Does memory speed matter? And we loss 15-20%?

    Regards.



  • 2.  RE: Does memory speed matter (DDR3-1333 or DDR3-1066)?

    Posted Apr 15, 2015 06:27 AM

    Hi Valerys,

    The combination would not make much difference but you would lose the performance of the 1333MHz RAM sticks. They would be running at a degraded performance or at the speeds of 1066MHz. Apart from that, there should not be any system crashes.

    Thanks,

    Ram.



  • 3.  RE: Does memory speed matter (DDR3-1333 or DDR3-1066)?

    Posted Apr 15, 2015 06:29 AM

    Thank you,

    How much this performance loss?



  • 4.  RE: Does memory speed matter (DDR3-1333 or DDR3-1066)?

    Posted Apr 15, 2015 06:32 AM

    Hi,

    The 1333 stick runs at 21Gb/s and the 1066 stick runs at 17Gb/s. So, there's a 4 Gb/s loss on each stick used. You may calculate accordingly depending on the number of RAM sticks used.

    Regards,

    Ram.



  • 5.  RE: Does memory speed matter (DDR3-1333 or DDR3-1066)?

    Posted Apr 15, 2015 06:37 AM

    I don't think that you will notice the difference...

    I would prefer to have MORE memory than FASTER memory :smileyhappy:



  • 6.  RE: Does memory speed matter (DDR3-1333 or DDR3-1066)?

    Posted Apr 15, 2015 03:07 PM

    The OP wouldn't notice the difference, but the customer could. Remember there might be memory-intensive applications (mainly Databases or SAP) running on top of the ESXi host where every millisecond when moving large data-sets could matter.

    But if the VMs hosted don't need large memory throughput at all (file servers, dhcp, dc, some app... hell almost everything else except databases :smileygrin:) then I agree, bigger is better :smileyhappy: