I bought a very inexpensive laptop from costco.ca.
Dead deal: 
<https://forums.redflagdeals.com/costco-ca-hot-299-99-hp-15-6-touchscreen-laptop-intel-core-i3-1215u-8gb-ram-256gb-ssd-2673529/>

Unlike most laptops these days, it has two sockets for RAM.
Only one was occupied.  It had an 8 GiB stick of RAM.

- two stick should perform better: allow dual-channel memory access

- many consider 8 GiB too little RAM these days.  I'm not sure that's true
  but more cannot hurt

I bought another 8 GiB stick with the same specs from Amazon for $25.99 
and installed it.
<https://www.amazon.ca/dp/B08P3KJRM5>

I ran passmark benchmarking software before and after the upgrade
<https://www.passmark.com/baselines/V11/display.php?id=202729010710>
<https://www.passmark.com/baselines/V11/display.php?id=202835509345>

The Passmark Rating (whatever that is) went up about 20%.
You can see that the laptop still has modest performance.

I'm glad the HP included one 8 GiB stick instead of two 4 GiB sticks.  
That made it cheap for me to upgrade (add one stick instead of replacing 
two) but it made the off-the-shelf performance worse.
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