Dell Dimension XPS T Series Owner's Manual page 6

UMB Upper limit segment address:
nnnn
Video BIOS shadowed
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Displays the address nnnn of the upper limit of
the UMB, indicating released segments of the
BIOS which may be reclaimed by a virtual
memory manager.
The video BIOS has been successfully copied
to shadow RAM.
No action is necessary.
No action is necessary.