Antares88: I have 9800GT that is actually the same 8800GT. As I posted before, I couldn't find good settings for that card. Also, I get strange differences in speed with every time running miner with the same settings.
If you succeed  finding optimal settings for that card, please share them. It's interesting how much can score that old cards. My best speed I get is ~25kh/s, but it's not stable as not always MCU gets the same load. Sometimes it gets only half of load and i get only 14kh/s