I just got the ICEBERQ 4 on my 9800SE and it works great. I got my card at 365/315 Core/Mem. The Arctic Cooling VGA Silencer will give you GREAT results also. If you did use the auto find highest mem or core you didn't damage it. Heres what I do to get the best results from my card:
1. close all uneeded programs
2. Set the card to default speeds
3. click the "find max core" button
4. Let the program run until a message pops up and says Core ran at ### for # seconds
5. Save this to a new profile with the mem still at default
6. Set the card to default speeds again
7. Click the "find max mem" button
8. Let the program run until a message pops up and says Memory ran at ### for # seconds
9. Save this to a new profile with the core still at default
10. Set the card to default and raise the Core to 5 #'s below the max you found
11. Now raise the Memory to 5 #'s below the max you found
12. Save this to a new profile
13. Restart comp if any artifacts are on your screen
14. Run "scan for Artifacts" for at least 30-45 min.
15. If any artifacts appear, lower the mem and core 5 #'s then repeat steps 14 and 15 until there are no artifacts(errors)
I hope this helped.