If your RAM usage is hitting 70% then personally I would add more RAM. The application(s) unless poorly written will leave some RAM. The tell tale sign is IF you have any 'FREE' RAM listed as shown below and IF you don't then the application(s) are cutting into the 'Standby aka Shared' RAM which in turn hampers RAM 'cache' to the GPU(s) if used for rendering. RAM is dirt cheap! Match your exact 2x4GB kit installed now. BTW - I 'render' SQL and with 32GB I have to cut the jobs into pieces; so it depends on the size project.
Again, 'Free' is the measure to update. Resource Monitor (note Free).
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