my OC : 500 - 950 Mhz, ideal config. Everything is perfectly smooth, no delays, no sluggishness, no errors. This is for over 3 months (earlier used config : 250 - 850 lv), battery holds for 1,5 - 2 days in normal use (web, phone, sms, some remote desktops, rss, youtube, twitter), for 24 hours if watching movies using video out cable. No overheating, I never play emulator games or such, just chess :P ...