Answer to "How do I upgrade the memory on the 12GB model?"Yes, the hard disk drives are the same both on the PS3 and PS4. Also, the 2.5" SSD can be installed. But for real, there is very small difference in the game loading.
Answer to "How do I upgrade the memory on the 12GB model?"Hi Alex. You or your friend must buy HDD bracket. This operation is easy and will not cancel warranty. All necessary screws and instructions will be in the package. PS3 also can work with 1Tb HDD. Package looks like this: http://community.us.playstation.com/t5/i...-id/183983iB6633F984DBFA235/image-size/original?v=mpbl-1&px=-1