PCGamer: Earlier this year id’s lead engine programmer said that id Tech 7 powering Doom Eternal could run at 1,000 fps. Which is kind of a funny theoretical laugh because nobody has a computer that can do that, at least I thought so, but apparently there are overclockers out there who can in fact do that.
Source: N4G PC Here's Doom Eternal running at 1,000 fps on a liquid nitrogen cooled PC