THat's good that AMD is improving. I never had anything like that before. I've never seen or hear too much when it comes to OCing dual cores. You probably don't even need to OC it when it runs so good with that extra core.
Well, when you test your motherboard, the power cable from the power supply is inserted into the motherboard slot. To get power, you have to plug the black cord from the PSU to the wall outlet. So yeah, before I final install everything (this is what a tech told me to do awhile back), put the mobo on the antistatic sheet or on top of your motherboard retail box. Have your RAM installed, video card (with the monitor plugged in), CPU, and all case wiring in there. The reason why it's best to do it this way is easier access to motherboard components, easier to hook up case wiring (you know how small they are and you need to be able to read the small words on the motherboard), and simple to troubleshoot if you do need to take something out or rewire your case if something wrong happens.
When everything's plugged in, boot it with the motherboard out on the retail box or antistatic wrap (this will also save a lot of time and frustration if it doesn't boot and you want to start over again. Your motherboard will already be out). Don't worry about the hard drive because it will be blank anyways. Not important. Make sure it goes through POST and then it will stop at a black screen because it can't find a boot agent. Normal. You know it's working. If you have RAM problems, CPU, or video problems, your screen will freeze up from the very beginning, not boot at all, or give you errors.
You can also play with the BIOS too and look at the PC Health status, and other configs for fun. If everything is working good without no errors, then turn off everything (just hit the power button), and carefully put the motherboard in the case. You may want to take out the video card first to make it easier. THen install it again along with the hard drive, DVD burner, floppy, etc. Boot and install Windows.