This is obviously a dated item but I've still got a Performa 6400 upgraded with a L2 Cache card running OS9.1 for the sake of nostalgia etc. Had a lot of weirdness with some hybrid foreign 400mhz hack for a long time then came upon Sonnet's rework. It only gets me to 350 mhz on my original 200mhz 6400 but it's been doing it flawlessly. And I don't have to reinstall RamDoubler every time I run TechTool anymore. This is a 5 star job. Thanks loads, Sonnet.