It has a small amount of internal memory, but you need a memory stick before you can save games.
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The last digit refers to the region, 3004 is continental Europe.
The psp 1000 has 32mb of internal memory while the 2000/3000 has 64mb.
the psp really doesnt have an internal memory. you can buy memory cards for it and it can go up to 16GB on a memory card. you can just look on eBay
There is no difference,it's only the model number.The European version is 3000 where as in Asia it is 3004.
The SONY PSP doesn't necessarily need a Memory Card to function. And by function i mean to play a game or use the Internet but up to now SONY PSP's are sold with no internal memory which means if you want to have Pictures, Videos, Music, and save game data you need to have a memory card. So basically you need the memory card if you want to use the PSP to its intended use.