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vSphere High Performance Essentials by Christian Stankowic

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Understanding memory configurations

When configuring memory for an ESXi host, administrators can currently choose between two major double data rate (DDR) memory variations: DDR3 and DDR4.

DDR4, being the most recent version, offers higher performance and transfer rates at lower voltage. However, on the other hand, it also increases the server's costs as it is a brand-new technology. DDR3 is a proven product on the server market that has moderate prices. Therefore, if it not necessary to have the last pinch of performance, the DDR3-based servers are basically a good choice.

Refer to the following table for a comparison between the DDR memory generations:

Standard

Clock rate

Commonly max. transfer rate

Voltage

DDR3

400-1066 MHz

1600 MT/s

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