Sorry, but I'm not arguing against your claim, but those models and textures, with the added effects look to me more demanding than just 64MB card.
MGS3 is a PS2 game, I dont think all the memory added up in a PS2 comes much over 32megs, so I doubt most 64meg cards would have a problem. I mean were's the normal mapping in that shot, the floor is a 'flat' tiled texture, dont get me wrong it looks good but not technically that demanding.