it's not so strange,is it?
9800se gold has 4 pipes and 256bit mem,
while 9600Pro has 4 pipes and 128bit mem.
Remember that 9500NP 64MB(128bit mem) and 9500NP 128MB(256bit mem) dont differ vastly in performance?
9800SE Gold and 9600Pro are just the same.
Additionally,9800SE has a much lower core frequency than 9600Pro does.