My favorite question.
Any time they stick letters after a model number it means something. Sometimes good, sometimes bad. This is all a scam to trick people into paying too much for a poorer product. Like when you are in Mexico the locals haggle to get the best price and charge you an arm and a leg for the same things. So you have to speak the language to find the deals:
LE = Losers Edition, brain dead graphics chip, memory interface or clock speed
SE= Substandard Edition, same as the above
No letters, basic part - this is not used much anymore, it was too simple.
Pro = used to mean improved clock speed version but now usually means a substandard version similar to LE or SE.
XL = becoming the new "no letters, baseline part"
XT = higher speed
XTE = factory overclocked version. a little faster but with the risk of premature failure or stability issues.
Nvidia variants
GT = baseline card, if no GT then it is probably a reduced performance card.
GTX = high end card, usually not overclocked.
XTO or GTO = these are brain dead cards that the makers know can be made less brain dead or over clocked easily. They have to let the public know this without offending the chipset makers (nvidia and ATI). Sometimes the ability to smarten up these cards disappears orders from the chipset makers. Smartening also voids warantees.
Brain Dead Details:
-Pixel pipelines are very important. the more the better. Brain dead cards use the same chip as a good card but the number of pipelines is less, either failed at test or intentionally disabled.
-Memory bus bandwidth. The bigger the bus the more info it can carry. Wider is better. 256MB is standard, 128 is brain dead, 64 is retarded. The cards will all use the same Graphics chip and probably the same total memory. They just choke the life out of the bus.
-Clock speed. there are 2. Graphics chip and RAM. The higher the better. If the Graphics chip did not do well in test they run it slower. They can buy RAM chips that run ok, at slower speeds cheaper. Both actions lead to brain dead cards.
Oh yeah. To answer your question they made a brain dead version of the 9200 so it would not compete with their new X600/X800 series cards. Many new series cards perform worse than older cards but marketing scams unsuspecting customers into buying the new carda with a "higher" numbering system at a higher price but no more performance. Thus the 9200 that is faster than the 9250 which uses a weaker GPU chip and faster than the 9200SE which is brain dead on clock speed.