My OC kernel results:

- ran Titan's maemo 19 for several days with /etc/pmconfig modified at different #'s. Negligible speed impact and the device got hotter during GPS, bluetooth AD2P, and tethering usage (Windows7 laptop & PC Suite).

- ran Titan's maemo20 kernel with /etc/pmconfig set at 250/850 for the last 3 days with the same negligible speed and warmer device temperatures. GPS, bluetooth AD2P, and tethering work fine. But on a long run today using GPS (eCoach) & bluetooth the battery drained completely and the phone shut-down.

My N900 background:
- It's an early Dell-sourced unit from when they first came out (don't know if that makes a difference).
- The device is fully updated to PR1.1.1
- I'm using flasher-3.5 to restore a stock kernel in between flashing OC kernels
- I use Conky to verify the proc is operating in the wider range set in /etc/pmconfig

PLUG FOR USING FLASHER-3.5:
For kicks, I removed the maemo20 kernel via App Manager and then rebooted the phone. It wouldn't reboot (no surprise, no kernel!). i plugged it into my laptop via USB, booted with the 'U' key held down, and then restored a stock kernel via flasher-3.5 in under 10 seconds.

On to experiment w/ Lehto's kernels.....