BOL states:
bpool_commited The total number of buffers with pages that have associated memory. This does not include virtual memory. --Here no doubt, Sql server Physical memory consumption
bpool_visible The number of 8-KB buffers in the buffer pool that are directly accessible
in the process virtual address space. When not using AWE, when the buffer pool has
obtained its memory target (bpool_committed = bpool_commit_target), the value of
bpool_visible equals the value of bpool_committed.
When using AWE on a 32-bit version of SQL Server, bpool_visible represents the size of the AWE mapping window used to
access physical memory allocated by the buffer pool. The size of this mapping window is bound by the process address space and, therefore, the visible amount will be smaller than the committed amount and can be reduced further by internal components consuming
memory for purposes other than database pages. If the value of bpool_visible is too low, you might receive out-of-memory errors.
--What Does this meant?
Manish