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

[valerys]

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.

[Ram8]

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.

[valerys]

Thank you,

How much this performance loss?

[Ram8]

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.

[brunofernandez1]

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

I would prefer to have MORE memory than FASTER memory

[Alistar]

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