to build off of Shadowstep's response above, most game engines don't support non-power of 2 textures. you can have non-square power of 2 textures (a 64x128 for instance), but you would never see a 96 x 96 or 48 x 48 in professional game development.
PS2 : 4 MB Embedded DRAM video memory bandwidth at 48 GB/s PS3 : 256 MB video ram 20 GB/s read to the Cell and XDR memory 15 GB/s write to the Cell and XDR memory PS4 : 4-8 GB ddr5 at ~48 GB/s