You'll have to do a little research as not all 9800se's are created equal.
There are 256bit and 128bit memory interfaces and maybe some have slightly
lower clocked chips.
Using the appropriate drivers e.g. Omega you have a fairly good chance of
switching on the other 4 pipelines without artifacts (about 50/50). So
finding a 256bit (L shaped memory layout) would yield a 9800/9800pro
(depending on clock speed). The link below explains it a bit better.
http://www.ocfaq.com/softmod/faq.php
Bit of a crap shoot really, but at the end of the day even if the other
pipelines don't switch on it's not a bad card, as long as you find one for
a good price (and if it's a 256bit i/f, even better)
Hope this helps a little.
Karl