I'm trying to fiddle around with SetCPU, but can't seem to get the 400mhz profile Also, what ROMS do you recommend for speed? And what guides do you think I should read? Thanks!
Assuming that you're rooted, the values in setCPU allows you to set to are determined in the ROM that you have installed. If you don't have a ROM installed which has overclocking, then I don't believe you can adjust the speed.
I've only tried 3 ROM, buglessbeast 1.1, DroidMod 1.0, and now running AdamZ's smoked glass 5.0.1. This one seems to be the least buggy but all are 2.0.1 platform and all the new ones are 2.1 so I can't comment on those.