I have yet to see an AMD-V option on any of my AM2/AM2+/AM3/AM3+/FM2+ motherboards (AM2/AM2+ doesn't even support so I guess that's why I didn't see that option). I have seen SVM which is AMD's Virtual extension. I would look at the motherboard manual as it should definitely show where it is. If you don't have one then go to the motherboards web page and download/view the PDF manual. For my FM2+ motherboard the SVM setting is in the CPU configuration setting along with other power saving features in the BIOS.
If having SVM on doesn't help then it's more likely to do with OSX not working so well with AMD based systems without the OSX image being modified a bit. As it has to do with pirating I guess we can't talk about it