http://www.vg247.com/2009/08/27/naughty-dog-uncharted-2-uses-100-of-ps3s-power-wont-work-on-360/
http://arstechnica.com/gaming/news/2009/08/uncharted-2-makes-ps3-shine-couldnt-happen-on-360.ars

For the first game, Naughty Dog's co-president Balestra estimated that they used around 30 percent of the power of the SPUs, now the team was able to use them to 100 percent capacity.


http://www.computerandvideogames.com/article.php?id=212148

Final Fantasy XIII will use "nearly 100%" of the PlayStation 3's hardware power, Square Enix producer Yoshinori Kitase has claimed.

When asked how much of the PS3's tech muscle FFXIII will make use of, Kitase told Japanese mag Dengeki PlayStation 3, "doesn't the demo use about 50 percent of its power? Of course, I think the retail version will make use of nearly 100 percent."

Well lookey here, where's Mr. "Dev's have only used 50% of the PS3's Power"?