you can have an ultra fast SSD but without adequate RAM you will end up with slow performance - 8 GB is what Windows needs to run well and if you have only that, having a browser open while running a game will leave you with 4 GB to play with, 16 GB is what you need.

I have no idea how DCS runs with extra RAM, but I suppose it is the same as Il-2 and P3D, this is me right now making a skin

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I can run P3D or Il-2 with the free RAM I have - with 8 GB you slow down your PC.