That's not true.
These "freezes" are almost always caused by device drivers, resource conflicts, power problems, heat problems, or even bad hardware. Problems like that are, in my experience, always solveable and I've never traced one back to a processor, AMD or Intel. CPU's generall either work, or they don't.
If you put the details of your machine, drivers, OS, and hardware here in a post, we'll try to help you solve the problem. Sometimes it can take time, but these things are always solved in my experience. Also, freezing only in AH is very possible... nothing else you run likely stresses your systems video, audio, and processing power all at once like AH does. Even other games I've played don't stress my machine as much as AH, so if there is an underlying problem, often AH will expose that problem when nothing else will.