Well, I've encountered some "difficulties" with my Intel box... the HDD is an old 40GB IDE one. On the Primary IDE channel I have two drives, the "master" is the HDD (jumpers set accordingly, using appropriate connector on ribbon cable) and the "slave" is the optical drive (jumper set accordingly, using appropriate connector on ribbon cable).
What happens is, when the system powers on it completes POST just fine, but at the point where it is going to load an OS it immediately restarts and goes through POST again, and just repeats this cycle. If I just walk away and let it cycle, eventually it'll boot from the hard drive (which is what I have it set to do from the BIOS), but it takes like 30-45 minutes or so (I've never actually timed it) of just letting it loop.
I'm not too worried about it though, as I haven't had time to use the box as I've wanted to anyways. And I also planned from the get go on purchasing a new SATAII samsung HDD and Optical drives for the rig. I'm quite positive that'll resolve the issue, though I've not been able to test it with an actual SATA HDD and Optical drive installed.
Anyhow, as to my Phenom rig- still love it! And I've never attempted any OCing of any component in this rig yet, haven't had the need to.