8GB future proofs you for awhile. 4GB is good for everything up to and including gaming today, but will probably be too small in a couple of years. If you love running virtual machines you almost can’t get enough RAM, VMs are insatiable RAM hogs. Other than that you will generally know if you need 16+GB of RAM, like if you’re big on Photoshopping big-sensor camera RAWs or crunching through map data or runnning a bunch of modded Minecraft servers or something.
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