Here is what I have on the Newer Technology MAXpowr G3 PCI cards. I have info from one person that the 220MHz cards can be sped up to 275MHz. Then the processor:cache ratio can be bumped from the default 2:1 to 1.5:1 with software, so he is running with his cache at 183MHz. This was with a Rev. C card; I don't know if the other revisions are basically the same.