W7 64bit 8GB installed, 6.01 usable

Going from your picture, you have 8192 installed and 2034 reserved, meaning the difference of 6158 is available, with that hardware. At that time, you were using 1577, with about 4400 unused.

I don't know that you can force anything else with that hardware, but there's no indication you need more than you have. Windows uses what's available when it needs it.

I'd start worrying about it if I looked in resource monitor and saw that I had say only 1000 unused on a regular basis, or at least some indication that you were bumping up against the ceiling.

Do you have any indication of that type?

No none yet.

Think of the things you do with the PC regularly. Think of the things that put the most stress on it. Do those things. While doing them, see how much RAM you are using.

If you still have 1000 or more unused when stressed, I'd worry about something else.

You can, of course, do something that causes Windows to use all that is available---but that might be something that is far more stressful than you would actually do in so-called real life.

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