The 3DS is more powerful than the Gamecube, probably more powerful than the Xbox. The CPU is slower, more than two thirds the speed of the Xbox, but it's got twice as much RAM and the GPU is just about twice as powerful.
On the technical side of things, the PSP is actually more powerful than the PS2. Very very slight. Almost identical, but still more powerful. We've seen more better looking games on the PS2 though, and that might be because not as many games were released on the PSP, but if it got the support, who knows if the PSP would actually have better looking games than the PS2? I think the real problem with the PSP was that it could only hold 1.8GB of data..







