At the same clock speed, it's on average 25% faster according to http://semiaccurate.com/forums/showthread.php?p=278368#post278368 http://semiaccurate.com/forum

At the same clock speed, it's on average 25% faster according to http://semiaccurate.com/forums/showthread.php?p=278368#post278368 http://semiaccurate.com/forums/showthread.php?p=278368#post2... . The caveat (and the rest of the thread) make for interesting reading.