After Effects not using free RAM?

Hi there
Just like to ask question regarding after effects and ram usage.
I remember before I installed the app Memory Booster - that allows you to keep track of how much ram, there was a healthy use of RAM there from after effects.
But i noticed today, whilst rendering and doing background cache rendering, the free RAM still available stays at around 4GB and I am wondering why it's not using this free RAM to help faster rendering?
this is my current multi-processing/ram settings on AE- essentially it should be using up to 6.5 GB of RAM as i allocated as I need faster rendering? Just wondering why it's staying stuck at around 3-4GB of free RAM on my system when it could clearly be used by AE. I want AE to use the RAM as it is the only running program on my system when i work!
Memory Booster down to 3.18GB with one safari tab open for Adobe forums, when exiting, it jumps back up to 4GB free RAM
Confused!
Thanks

Different projects, different footage attributes, different AE features used, different effects used, different delivery specs....
...are you comparing apples to apples, or apples to ORANGES?  We don't know that.

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