ReadyBoost is used to improve hard drive performance. The external USB drive is used as a cache which Windows uses it to store that it anticipates the programs the are currently being used will need.
You can purchase a single 16GB stick of DDR3 SO-DIMM RAM that is compatible with all laptops which uses a Broadwell generation Intel CPU like the i5-5200u. However, it is not cheap. The 16GB stick of RAM is manufactured by Intelligent Memory and there is only one place you can buy it.... for $325.
That's a good question. I have not experimented with readyboost myself. Since readyboost is a software performance increase, it still wouldn't perform as well as real hardware, the RAM.
If he could right click the task bar and click "start task manager" and go to the performance tab, it will display RAM usage. It be a good idea to have all the programs he runs open to see what his usage actual is. If it's crossing 4GB, then an 8GB stick would definitely be worth while.
ReadyBoost is used to improve hard drive performance. The external USB drive is used as a cache which Windows uses it to store that it anticipates the programs the are currently being used will need.
You can purchase a single 16GB stick of DDR3 SO-DIMM RAM that is compatible with all laptops which uses a Broadwell generation Intel CPU like the i5-5200u. However, it is not cheap. The 16GB stick of RAM is manufactured by Intelligent Memory and there is only one place you can buy it.... for $325.