Honestly I have experience with Rust on intel hd 4400 graphics with an i3-4170 and 8gb ram (before I upgraded to a gtx 1060). It was playable for me but the experience was dried out by the constant frame drops and very very low settings. The game is still quite unoptimized and when you get frame drops you get them good. I would have to play on like 600x400 res, and turn all the graphics off and still barely get 40fps. The frame drops came around a lot for me when I would get in battles which made me mad because I would lose loot. Its all up to you if you wanna test it out..