Bethesda has released their recommended and minimum specs that'll be needed to run Fallout 4. 8GB of RAM is both minimum and recommended and it'll be eating 30GB of space on your PC, even more on console.

Fallout 4 Specs shows it needs modest RAM and not very much HDD space.

　　Also in the blog post we learned that the game will be unlocking on a rolling release schedule set at 12:01 AM on November 10th in every time zone. Fallout 4 will be available in Asia on the 11th at 12AM however and on December 17th at 12AM in Japan. This means some will get to play it before others.

　　If you were curious when you'll be able to play with the Pip-Boy companion app (even if you don't have the collectors edition with a physical Pip-Boy phone dock), that'll be available starting on November 10th right along with the release of Fallout 4.

　　And don't forget that the Xbox One and 360 controllers will be fully plug-and-play supported just in case you wanted to to do that. Also, I'd imagine that the forthcoming Steam Controller will also work, though it's not even out yet. Now we just need VR support. I wonder if VorpX will release a profile for Fallout 4 sometime shortly after release?

　　Minimum

　　Windows 7/8/10 (64-bit OS required)

　　Intel Core i5-2300 2.8 GHz/AMD Phenom II X4 945 3.0 GHz or equivalent

　　8 GB RAM

　　30 GB free HDD space

　　NVIDIA GTX 550 Ti 2GB/AMD Radeon HD 7870 2GB or equivalent

　　Recommended

　　Windows 7/8/10 (64-bit OS required)

　　Intel Core i7 4790 3.6 GHz/AMD FX-9590 4.7 GHz or equivalent

　　8 GB RAM

　　30 GB free HDD space

　　NVIDIA GTX 780 3GB/AMD Radeon R9 290X 4GB or equivalent

　　Console Storage Space

　　Make sure you have enough space in the vault to store Fallout 4.

　　Fallout 4 requires 28-35 GB depending on territory and languages supported.