Upgrading memory to 16 or 32gb

May 14, 2018
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Hi,
I have a zbook 17. At the moment I have 2 equal simms under the keyboard installed =8gb and 2 different Sims on top =also 8gb. Do I run now the fastest way? Or should the simms on top be an equal pair too? Can I go faster if all 4 simms are the same? Is there a difference in speed if the first two and the second two simms are different in brand? I know speed needs to be the same. This all the have the perfect dual channel setting for the laptop? Is it enough if only the first pair of simms are in dual channel or is it better to have the second pair also in dual channel?