No anomalies up to 181 MHz on my AGP V3 2000. I run at 179. I have lots of anomalies at 183 and it crashes at 185. A few people have hit 190+ in 3D, and I can run 2D fine over 190.
I have a 50 mm fan on my CPU with Arctic Silver, and now I believe my memory is what is giving me the problems.