Well, it'll only have 4 pipes if it is a 9800 SE.
If you're worried, run 3dMark2003 on it and compare your results to those on the web.
If it's an SE (4 pipelines) then it'll have about half the score in the fillrate tests of a regular Radeon 9800 non-pro.
If the scores are comperable, it's 8 pipes.
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Radeon 9500 (modded to PRO w/8 pixel pipelines)
AMD AthlonXP 2000+
3dMark03: 3529