Here's an easier to read summary of the thread:
- the VRMs on your board aren't sufficiently cooled. These are what the power flows through, and they get hot. Your board lacks VRM cooling making it impractical for overclocking. As well, your board doesn't have very many power phases ; these smooth out the power being sent to the CPU.
- Your chip is a C2 revision ; it doesn't overclock nearly as well as the C3. The C2's are notorious for having trouble reaching 4.0GHz.
- We suggested, with your budget of $250, to get an AM3+ board better for overclocking with a 960T zosma processor. The AM3+ board permits you future upgrades, namely Bulldozer [8-core processor, which goes past 4GHz+ easily]. The 960T is a Thuban processor, which is 4-cores but can be potentially unlocked to 6-cores. Even if it doesn't unlock, it'll still overclock much better, it's a higher quality chip.
TL;DR You have a crappy CPU/combo. Good in theory, but the specific revison + board were poor quality. So get a new 4-core [possibly 6] processor with motherboard for under $250 and have the possibility to upgrade to an 8-core when you need it. They'll most likely be around $100-120 when you'll need to upgrade.