Why? Because this undocumented feature varies with the model you have. So the answer must be to supply power according to what's on the label.
The transformer is not that expensive so I can't guess why you would not do this the right way.
Hi recently purchased a PS3 Mode: CECH-4001C (Slim 500GB model) from Canada, planning on bringing it to the Philippines since i'm moving there in August. Need to confirm that this is indeed World Power capable from 110v (US & Canada) to 220v (Philippines) without the use of a transformer. The unit itself says 120v on it but i have seen posts everywhere that say this model is world power capable. Is this Confirmed? I know the BluRay discs and Game Discs as well as DVDs are region formatted so those aren't a problem, i need to know if i can use this unit without issues. Thanks!