My HP desktop rig originally came with just 4 GB DDR4. Over the course of the first 12 months, this gradually increased up to its max; it now has 32GB. This all helped enormously.....but as others have said, the biggest performance increase will come from swapping the internal HDD for an SSD (in my case, Toshiba HDD -> Crucial SSD).
That made a HUGE difference.....but in "Puppy's" case, it's only noticed at boot-time, since she runs the session fully in RAM (which is a magnitude faster still, although the newest NVMe drives - with the Phison controller - are now approaching RAM speeds).
I'm content with 500MB/s read + 350MB/s write. That'll do me, since Puppy does everything in the RAM-based virtual file-system, and only saves at shutdown.
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If you've got the room for another stick, go for it; it certainly won't hurt. Me, I'd bite the bullet and take
@Condobloke 's recommended route (if your budget will stretch to it); buy the largest kit your motherboard supports, and upgrade the lot.
It's a little bit of "future-proofing", and will help to extend your machine's usable life-span. It's an unfortunate fact of life, but all software steadily increases in size as time goes by.....so the more 'room' you have to accommodate it, the better. Most manufacturers tend to supply decent CPUs OOTB, but then spoil it by skimping-out on the other essential componenets.
Mike.
