We all know Perfect mode has had its share of bugs, to the point where many have probably forgotten the mode even exists, lol.
I was running the omega 3.1 drivers for my 9800 Pro 128 and getting a not quite playable 20 frames/sec. However, when I found out that ATI released its new 4.1 drivers, I immediately went to Omega to see if a new package had been created and YES! It has! And it's great! I have been getting a playable, stable 35 to 40 frames/sec with no stutters, artifacts, see-through objects, checkerboards, etc. This is wonderful! I urge you to try them if you have been previously unsuccessful with Perfect mode.
Considering my system is almost 2 years old, the results are impressive...
Dell Dimension 4550
1024MB PC2100 DDR
ATI Radeon 9800 Pro 128
Get them here: http://www.omegacorner.com/ and report back! I am happy so far