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The official documentation only mentions the minimal hardware capable of running Unreal Engine 4 editor at all.
You need better hardware to work efficiently. Recommended hardware requirements depend on your specialization and utilized tools.
Specs below ignore the existence of a hard disk drive, as HDD is significantly slow down any non-trivial operation in the editor or related tools. Its usage should be limited to the additional file storage, i.e. project's repository
This table should give you a quick overview. We look at the power/price ratio of the hardware components recently available in stores. Your specific needs may vary, the article will try to cover that in sections below the table.
Unreal Engine beautifully utilizes multi-threading in many critical areas. More CPU threads mean work done faster, i.e. 16 thread CPU will compile shaders over 2x faster than 8 thread CPU (given that some CPU cycles are busy with other tasks).
- Confirmed 100% CPU utilization of 64 threads while compiling code (Unreal Build Tool).
- Confirmed 100% CPU utilization of 64 threads while compiling shaders. If you're an artist working daily with shaders, more CPU threads will make less wait.
You need to have enough RAM to properly utilize all the available cores. Unwritten rules say you need at least 1GB RAM for every CPU thread.
You're able to launch multiple instances of the multiplayer game locally, practically player as many players at once. It's required to test if the given feature works properly. You should be prepared that the every next instance of the game will eat proportionally more RAM. If a single instance eats 10 GB of RAM, running 2 game instances will eat 20 GB. And a dedicated server would be another game instance.