Yes, you can upgrade a mini PC. These are the parts to look at

There are some models that allow you to upgrade the GPU but these are relatively rare. One such mini PC is the Intel NUC 9 Pro, which comes with plenty of space and PCIe connectivity to add a discrete ...
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This secret Microsoft app promises to improve your Windows performance, but it's mostly just reorganizing what you already have

Reclaiming RAM can help in situations where your system is truly low on memory, but Windows already manages RAM dynamically.