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According the the article, they are 2x 6800GT.
I highly doubt the ones pictured are 6800gt's. Why? Even though they are PCI express video cards, the 6800gt's still need the 6-pin external power adapter. In that picture I can't see anywhere where you would plug in a 6-pin connector. However, Anand did test both 6600gt's and 6800gt's.
Back on topic, I have tried contacting Antec reguarding stability with a 20-pin ATX PSU. They basically gave me the run-around and suggested I buy a 24-pin ATX PSU. How thoughtful of them of giving me a sales pitch instead of directly answering my question. I guess we will all find out soon.