I on battery mine is unstable at 633 MHZ on Froyo by laszlo kernel, but on charger it works. Using 595 is stable, you can set it in performance settings, you don't need app with this kernel. I set Minimal on min 122.
As I know this MSM7201A has 2 cpus, not changing frequency, but rather switch between cores.(found this information on Wikipedia) I have this old telephone and found it a bit hard to operate sometimes, but its still powerful enough to run most applications needed, and with those applications on SD ext I can perform almost anything, but the battery life is a bit small. But lets say its first android telephone(2008), full qwerty and lot of fun making it operate.