Not all the engineering samples have unlocked multipliers, and they are not neccisarly better for overclocking either, in fact my 3.2 engineering sample is a much worse overclocker than a retail 3.2. In any case if you want to overclock that 3.6, you will need very good cooling. My 3.4 is running at 74-75c under full load at 3.82ghz, with a thermalright XP-120, artic silver 5 and a 120mm fan. Thermal throttling will start to kick in at 80c. If you do happen to have unlocked multipliers, try and up the multiplier, if not you'll have to do it the standard way and up the front side bus.