OK, so there may be a little truth in this one. With a really old computer, adding more RAM (memory) can give it a speed boost. An increase from 1GB to 2GB will see a noticeable improvement in an ageing system.
But in a modern machine where 4GB is the norm, the benefit is much less noticeable. Increasing to 8 or 16GB will only really benefit software that can take advantage of it – gaming, or video rendering/production for example.
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