And also how to upgrade the RAM from 4GB to 12GB for $15 using an SD-memory card to bring your low cost computer up to current standards.
In the USA you can try link: Renewed Computer Technology and even order it online with free shipping I believe. In Canada you can do likewise from link: PC’s for People. And in Australia there are several places listed by the link: government.
Most low income computers have the Ubuntu OS and to use an SD-memory card as virtual memory you have to use it as link: Swap space. If you have a Windows OS look into the link: Readyboost feature.