Thanks for the reply.
I'm planning on doing more tests w/ different games. From what I've read, Fallout : New Vegas is prone to stuttering regardless of hardware.
I'm also not impressed with CrossFireX. CCC shows it enabled, but I'm not seeing much of a performance increase.
Lastly, what about buying a small SSD (like 30GB) and installing just the game there? I realize frame rates wouldn't improve, but load times / read time would be much faster. Right?