We have a CPU section for this. Also, it's addressed in CPU 101

Assuming of course you can afford itThe AMD X2 series outperforms the Pentium D series at anything you can throw at it.
The Pentium4 EE is a singlecore chip remember? Pointless to compare to a dualcore box.but the AMD X2 is by far the best dual core, in fact it even beats the P4 EE in some tests.
Thats awfully broad.always get the X2 3800+
We got PMs for this stuffThis is off topic but, what school do you go to?