If I'm upgrading RAM on a new iMac to 64gb (currently has 8gb, 4 slots) is it better to go 2x32gb or 4x16gb? Is there any difference in terms of reliability? If all is equal, I'd prefer to go with using two slots in case I want to upgrade later.
If two is ok, is it ok to leave the older smaller RAM in the other 2 slots?
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