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PS2 is a extremely powerful machine technically. But its archeticture is COMPLETELY different to a PC. And its design is not very efficent as well. Many programmer manger to squeeze >90% of ps1 power out. Company like squresoft.
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Actualy, it's a very efficient architecture for games, it's merely not designed in the same way that other machines are, so developers have to change thier way of thinking when programming it. You can't cache shed loads of textures in the TMU as it has little vRAM, but it does have fook loads of bandwidth.
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While in XBox, which is bascially a Intel Celeron 7xxMhz, and 64Mb Ram, And a Geforce 3.5 in it. So some may be asking why xbox with such low spec can play games so well.
Fist, Xbox games are only in 640x480 resolution, and resized back to tv resolution to archieve better image quality. It doesn't need full 32 bit colour ( not quite sure if i am correct )
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The X-Box is an inefficient gaming machine. It's basicaly a PC (which is a multipurpose machine) in a box. The good thing is that developers are used to the way of thinking entailed in programming for the PC, so it effectively has all it's potential on hand.
As regards PS2 vs the X-Box in power, I wouldn't say either way, but what I will say is that the PS2 has far more untapped potential than that of the X-Box and Cube. Thus games on the PS2 (and PS3, which will have a similar architecture by many accounts) will get progressivly more impressive over its life span, much like the PSX (which although not as drastic, was far less PC in design than the Cube or Box), wheras the X-Box and Cube games, although they will improve, we won't see the massive improvements that we will from the PS2, or we did in the transition from FF7 to FF8 and 9.
As for the power that is needed.... from what I understand, CXBX is essentialy an API wrapper similar in style to that of WineX. The PS2 emulators are more like VMWare, which emulates the hardware itself. Now, try to run an app on VMWare, and compare its speed to that of WineX. Add to that the fact that the PS2's architecture is radicaly different to that of a PC.....
If I were to speculate, I'd suggest that a geForce 4 Ti and a 1.5GHz machine would emulate the Xbox more than happily wheras you might need double, perhaps even triple that power to emulate the top end games on the PS2. I hasten to re-itereate that this last paragraph is almost entirely speculation.