Power is relative, but if were talking about raw computing power, the PS3 beats the 360 by I dunno what was it, 4 times? The cell is an absolute beast when it comes to crunching numbers. They did the folding test to see how many flops per second (?) each processor setup could handle and the PS3 slaughtered most of the computing world xD
From 0 to KICKASS in .stupid seconds.