Its very important that upon OC'ing that cooling becomes even more critical. If your current cpu HSF is what was installed to the cpu was factory, it won't support beyond a given cpu level. In other words, if the HSF support only 2.13, then anything above that with factory setup just won't do, replace with a better one for 2.8 or 3.0. Again, no details on just what the HSF is. While you have extreme editions of ram, they too must support or be good match for the upmost stable system, review those specs and see what they apply for. The whole system must come into play to support the OC'ed level while the MSI seems friendly to OC'ing to get to a wall and thus peter out, again cooling is so important, if you have added cooling or rely totally on current cooling, it may not be enough. Also video cooling fan if installed add a slot fan next to it to better exhaust. The mtrbd. maybe sensing a heat build-up and plays it safe and causes reduced level of cpu output in order to save the cpu from damage, review what bios protection schemes are used and/or at least the "over-temp" level. The cpu has a over-temp build-in with no user input, so beware of that, it as said can reduce output to save itself or even shutdown system or reboot depending on bios setting.