Have you stress tested using OCCT and made sure it'll stay under 60c for extended periods of 100% use? If so, you're fine. The specified maximum by AMD is 62c for the FX-8xxx chips, same as it was for the Phenom II processors. I've accidentally exceeded that for a brief moment or two a few times and gotten lucky. Anything south of 55c under a stress test like OCCT and you're okay. In general though, AMD overdrive and other software overclocking is always less efficient than BIOS overclocking- it gives itself extra wiggle-room for stability by giving a bit more voltage (thus heat) than it likely needs.
Yeah, thanks for the posted maximum. I cranked up ray tracing in my 3D suite and rendered it for about 3 hours and it never once got below 100%. 56C was the maximum I saw in the logs. Since I need the extra stability though, I'm probably going to lower it to 4.3 Ghz. And I used the TurboCore because I couldn't find the Turbo Speed in my BIOS, and I don't need the processor to run at 4.5 Ghz all the time :P
Thanks for the help guys.