Think it depends on rom. Now I'm running sensable 3.1. Right after I flashed that rom I flashed zarfure overclock update. When the phone rebooted, I ran setcpu and I set to 806. Anything higher will cause eris to reboot.
I figured my issue out, I had the wrong ROM, had to get a new version of Ivan's rom that had the overclock kernal, and also I had to wipe clean after the install to allow SU to fully work.