Horizon landscape effect and Specs

Hey guys, i’m new in Unrel Engine 4, i became from cryengine, 'cause cryengine is so buggy :stuck_out_tongue:
So… there i go,
My question is, there’s possible to make a landscape horizon effect? 'cause i’m making a post apocalypse game, and if i use a real landscape there, it’s will be so heavy for low-end PCs…
And, my other question, My Specs 's good for using urneal egine?
Intel Core i5 760 2,8GHz
8GB DDr3, 1TB HDD + 320GB HDD for backups
NVidia GeForce GTX960 2GB GDDR5
'cause i use 2x 1366x768 monitors, but there’s some lagg in some scenes…

Thank you guys \o
And sorry my english, it’s not my primary language :smiley: