Yes, I'm defending sound scientific practices. He calls crossfire crap. People claim it works perfectly with Vsync. He says, ok I'll test vsync. He says, AMD cards still run like crap even with vsync when they drop below 60 fps. He then goes on to say that the nvidia SLI system that maintained over 60fps had no problems with vsync on. All while never testing Crossfire with vsync which was the entire entire purpose of the article. Seems SUPER legit.
Wait a second. You misunderstood the dual SLI setups role in the test. He just wanted to create two scenarios. The Titain SLI setup is to create a system that can run with v-sync on and maintain 60 FPS 100% of the time in his test. This is the base line machine. It is the example of perfectly maintained 60 FPS. I suppose he could have taken the label off the system, so people wouldn't focus on what is powering it, but that is what people often ask for.
He also ran another system with 30 FPS, with v-sync that never varied. This is the 2nd baseline machine. This is to show exactly what smooth 30 FPS looks like, that has no variation in frame times.
Then he ran the 7970 on its own in positions that it cannot maintain 60 FPS. This is to show how v-sync looks like when you do not maintain consistently spaced out 30 or 60 FPS. It is to show just how it looks when frame delivery times change between 16.7ms and 33.3ms over and over.
I suppose to not offend anyone, they could have used a single 670 or 680 instead of the 7970. As they said, it wouldn't matter which brand of card was used, it results in the same delivery of frames.
It seems to me that you saw the test systems and just assumed what they were trying to explain, rather than reading it.