with 200GB of memory I can't believe this is an x32 system?
Where do you see that?
Min and max memory only set the limits for the buffer cache, in Denali I beleive this will change, however there are several memory pools and such which also take memory.
Most of those memory pools are part of the buffer pool and hence constrained by max server memory. It's the non-pages memory that's outside (backup buffers, linked server drivers, CLR, thread stacks, extended procedures, a few others)
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