http://wccftech.com/sea-of-thieves-540p-15fps-support-pc/

Although Sea of Thieves has support for 4k and 60 frames per second on PC, Rare wants to cover the widest range of hardware possible, and while they prefer not to even say what the minimum requirements of their pirate multiplayer title will be, we now know that the developers want to support 540p resolution and 15 fps on PC.

As strange as it sounds, Rare is interested in everyone being able to enjoy the title of pirates. That way, not so powerful systems will have an opportunity to run Sea of Thieves without many problems. Joe Neate, executive producer of the title, talked about the subject recently with the PC Gamer and said that the title will look great no matter where we play it.