Thanks to everyone for the answers :)

I already stated in #3, it's disabled. (no paging file)

Then it works exactly as I suspected, I just had no idea Windows had a bare minimum it needed to cache.

That's exactly why I'm asking - if I knew how and why, I wouldn't need any help.

So what you're saying is, it's impossible for me to use all of my RAM without a pagefile?

I've made a screenshot from the performance tab of the task manager, including one with a program made to exhaust memory - which crashed due to no more memory when it should still have ~4GB.

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My memory is all usable as windows sees it, so no different "usable" size.

Yes, I've disabled the page file as I have more than enough memory and an SSD - consequently the modified memory has...

I have 16 GB installed, Windows sees all of them, but when I have 4 GB left it refuses to use any more. Instead Chrome gets "no memory" errors and Windows crashes apps. It's consistently 4 GB it...