Really amazing! Very powerful, it allowed my 733 quicksilver to run 2-3 instantiations of Altiverb. In the beginning (w/orig. processor) it could not run "one" reliably. The L3 cache was a big one for 733 QS. I run mine at 1.3hz and seems to be fine. If I had the energy I would set the jumpers to 1.467, but it has been so reliable I have not bothered. Well worth the money. bc