Yes the UMD sustains 2 gigs and Ps2 discs around 6 but do this math Days during its cutscenes had PS2 graphics and the PSP has naturally better grapphics than that. So if Ds does PS2 graphics and PSP does better than DS then PSP can do better than PS2
You realise that the DS only had PS2 graphics in the voice cutscenes, which were few and far between, compared to the over 200 in Kingdom Hearts 2. The actual gameplay graphics in Days were not in PS2 graphics.
Days gameplay.
KH2 Gameplay
Big difference. Also, KH2 was able to render 1000 enemies, Days could onyl render a few at one time.
And you heard that where...?
Kingdom Hearts Birth by Sleep - Wikipedia, the free encyclopedia
Look under development.
inb4wikipediaisanunreliablesource
It comes with a citation from Famitsu.