Good quality RAM, bought as an upgrade, taking my main system up from 16GB to 32GB - I replaced 3 year old Corsair RAM, which is still working fine, so I'm hoping this will last as well.

This Corsair Vengeance kit has long been one of the most popular choices for builders, and in its 32GB form, is marked down to it best price on Amazon for quite a while at Amazon at just £48.