I think my (11 y/o) son said 2gb.
He has a 1 gb in his PSP that we paid extra for when we purchased it for him but he found a memory stick with even more memory. He is starting to use his to download music now & the rep at
Best Buy said his 1gb can hold thousands of songs

.
What do you plan to download on yours that you need so much memory? (Just being nosy...)
P.s. have no idea what a "PRO" is.

I'm lucky I can turn his PSP 'on'!