Core Performance Boost is one of the C's I was talking about. Straight from an AM3+ Biostar FAQ Page.
If user wish to let CPU to run with minimum power, enable Core Performance Boost, K8 Cool&Quiet control, and C1E Support in CPU functions.
Either way, that won't or shouldn't have any affect on what is going on here. If it does, you have a bad chip or board and need to start RMA.
As to the PSU, having a bottom mounted PSU and leaving the rig on the carpet is a no no. It'll burn up any PSU facing the proper way. Thing is though, Kingwin units are all known of cap whine which is a good (and #2) indicator of **** PSU. I wouldn't run a 125w CPU on it no matter if it was Intel or AMD. If your temps are now fine, the things I would look at in order:
Set all bios settings manually while using 2 sticks of RAM. That includes CPU stock voltage, CPU clock, RAM speed hard set to 1600, all RAM timings, RAM voltage, NB/Core voltage (IMC), power state features disabled, all fan headers set to max speed, take out any unnecessary things you don't need in your case.
Motherboard bios flashed and try default then manual settings.
Check with a multimeter (if possible) 12v load on the PSU. Could be difficult if you've never done it before. After the previous, assume it's PSU.
Try a borrowed or spare PSU to see if problem persists.