EXCELLENT FREAKING ARTICLE! Wow, and to think I was shopping just today for a second AMD card. I will avoid this dual card nonsense like the plague until Tom's follows-up and gives the all clear. I will stick to single card configurations until that day.
This is a basic STATISTICS problem folks. It's called "VARIANCE". You remember those FPS graphs in those articles? They should be STRAIGHT HORIZONTAL LINES, not ups and downs. UP + DOWN = MICROSTUTTER.
Too much in computing (and in life) focuses on QUANTITY (FPS!) but not enough testing goes into evaluating QUALITY (reduced variance!).
BRAVO TOM'S HARDWARE! The emperor has no clothes!