Update Clustered Column In Place?

Is there any way to update a column in a clustered index without incurring
the cost of reordering.

Example:
Create table TableX (
Col1 int,
Col2 smalldatetime,
Col3 varchar(10))
go
create clustered indext ix_test on tableX (Col2, Col1)
go
update TableX set Col2 = '2004-12-07'

-- Yes I specifically left off the criteria to update every row.

It would seem to me in this situation that the data types require the same
storage, all rows are being updated in one transaction, and there's no new
to reorder since all will be the same.

Thanks,
Danny