installed video memory > the physically installed graphics
total available graphics memory > as the name says it all, it is the total graphics memory that it is able to deliver
meaning your installed video memory + shared system memory
the shared system memory is the amount of graphics it takes or steals from your main operating ram., it is dynamically alloted and depends on a quite a few considerations such as installed ram, installed operating system, required ram, required graphics memory for the application and such
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