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Here's one upgrade that you desktop PC and Mac users might not have thought of. Adding a bigger screen to your system – or, if the system allows, a second display – is an excellent way to improve performance without having to crack open your system.
If you work with a lot of applications at once, or your job involves having to split your attention between two or more applications/data sources, then adding a second screen means you can give the applications you use more screen real estate, making them visible all the time.
Many modern systems have two ports (or sometimes more) for displays. If not, you can add a graphics card that will support multi-monitors.
Even notebooks can support dual screens, although with some you may have to invest in an adapter.
Don't underestimate the enormous productivity boost that adding a bigger -- or second -- display will bring.