you can damage anything in OC'ing. so the best bet is if you cant afford a new chip or new RAM dont try and OC... but this is OverClock.net so you will want to try.
As long as you slowly change values and check stability you should be fine. only up the voltage if the system is unstable at your current speed and voltage. you do not want to start out with a High voltage and high speed and find that it crashes. slowly up the system and find that sweet spot.
running higher voltage makes things hotter so keep an eye on temps. I have heard the NB can get quote warm when you add an OC on the CPU and the Bridge.
a 650W supply assuming half way good 80% or higher efficent you will be fine. with anything, you may not be able to add a tri fire 5970's to the board with that PSU but with the 5770 and every thing else you should be fine... This is a good calculator to use.. ( http://extreme.outervision.com/psucalculatorlite.jsp
This is a fairly good guide showing an Phenom OC... ( http://beezlan.com/?p=151
Bus Speed and Multiplier are explained above.... with the balck version like I have you have more range of multiplier then with the CPU you have. IIRC.
the north bridge and memory you want to get set and stable before working on the CPU. You will be able to obtain a more stable OC doing it this way. if you change the multiplier you dont really change anything but the CPU speed. buy changing the bus speed you effect other things. that is why you usualy want or need a combination of both to get the best and highest OC.Edited by Magus2727 - 7/1/10 at 7:14am