There's no physical difference, the number at the end is the PSP's region which will affect what movie UMDs you can play, and some online features such as the PSN. PSP-2000 is the Japanese regional variant, PSP-2001 is the North American.
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The number at the end is the PSP's region which can affect the movie UMDs you can play on it, and PSN availability. One marked as PSP-2000 is a Japanese model, PSP-2001 is the North American model.
The PSP 3000 is the third generation of the PSP system, there is also a PSP 2000 (AKA slim). a PSP 1000 (AKA phat). and the PSP go, which is the most recent iteration of the PSP.
PSP 2000 is the second PSP Version also known as the PSP slim. There is a newer version called PSP 3000 which more things were added to.
there isn't a difference. its just like the i pods. there is a gen. 1000 a gen. 2000 and a gen 3000. but if ur talking the difference between a psp gen. 3000 or a psp go then the psp go is smaller. u have to have online for it. and u cant buy regular game disks for it.
The PSP-1000 is much heavier than the 2000 and 3000. The PSP-2000 and 3000 are very similar though the 3000 has an antiglare screen, a built in microphone and the HOME button has been changed to the PS button.