I am really amazed that people think the game looks like FO3 with texture packs. The polygon count alone is noticeably higher in FO4, by a LONG ways. The volumetric lighting is a big improvement. The character animations are more natural. There are cloth/hair physics now as well. Put the two games side-by-side and and you won't think they look the same. Other than the fact they are both Fallout games and have the same atmosphere. The game will use more than 4gb of memory. It is a 64bit client. That I can assure you. One of the biggest reasons is the fact that interior/exterior cells are, for the most part, gone. It is all together now and seamless. This was mentioned during one of the early dev interviews. There are still some areas with loading but very few. The new lighting system was a big part of making it possible I would imagine. No more need for interior spaces with static lighting. Now the lighting comes from object which emit light and, of course, the sun/moon. Regarding the engine. This is not "The same gamebryo engine they have been using since oblivion." The Gamebryo engine hasn't been used since FO:NV. Skyrim used the Creation engine, and FO4 uses an updated version of the creation engine, as stated by Todd Howard at E3. I honestly was not surprised one bit by the system requirements. There was one scene which reminded me of The Witcher 3. Lo and behold, the requirements are almost identical to that game. The specific scene I am referring to is the Swampland one. It looks of the same quality as the swamps in The Witcher 3. Regarding 64bit. Almost everyone these days uses 64bit. There is almost no reason to not upgrade to a 64bit OS. 32bit applications run on a 64bit OS just fine. I have been running 64bit since 2007 without issue. If you are worried about cost, welcome to PC gaming. Except this time you are paying for OS instead of(or in addition to) hardware when preparing for the next big game. The plus side is that you may not have to upgrade again for a while, since 64bit will last for years upon years. The only reason to upgrade the OS further is to get the latest directx. Only Windows 10 has directx 12, for example.