If you mean the game it self - that depends on FS.
If you mean the UE4 and the resources you need to make maps:
I find the minimum (actually usable) requirements to be 4GB RAM, something capable processor. I have a 3.6GHz Quadcore. Which gives me more than enough processing capability.
I do not know how much use UE4 makes of the GPU for mapping but again: I have a 7700HD - that card seems to be more than powerful enough, I'd estimate a card with half the memory (512MB clocking around 800GHz should be good enough to map.)
Why I say my specs are "more than enough" even though they are lower than the suggested minimum requirements for UE4: I don't feel hindered in anyway by my hardware this might well be the case because UrT does not require any huge maps. For mappers making huge maps (or maybe jumpmaps) this might not be true for them. But maybe Jump maps will be made in several Levels(maps) who knows how that mode will be developed in UrTHD .
PS: My experiences/opinions/whatever are not base on any technical expertise.
And:
Quote:
It sounds easier to me to write, compile and execute a binary (provided I had .map and .whatere-ue4-uses specifications) than to follow that procedure.
I meant that the procedure seems a bit time intensive.