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For those looking to perhaps see a few more frames per second (or FPS), you can now check out Doom running on the Vulkan API. Earlier today, support for Vulkan went live for the game.
When we were looking to adopt Vulkan for DOOM, the main question we asked ourselves was: “What’s the gamer benefit?” Ultimately the biggest benefit will be high framerates. There are a number of game-focused reasons super-high framerates matter, but primarily its movement and player feel. The game just feels amazing running that fast, so we made it a priority to try to really exploit the available hardware on PC.

We also anticipate some older GPUs will now be able to play the game at good framerates. We hope the range of GPU support widens with additional game and driver updates. That said, this is the first time a triple-A game is releasing on a brand-new API and brand-new drivers so there may be a few bumps, but our testing is showing really great performance and stability.

Vulkan is a cutting-edge next-generation graphics and compute API from the Khronos Group. Vulkan allows very low-level access to the hardware and moves most of the driver overhead into the developers’ hands. For PC gamers Vulkan will bring speed and features to DOOM, which is a big upside.

To make the most out of Vulkan, new drivers for both AMD and Nvidia users have been released.

A handy FAQ has also been posted by Bethesda to see what this whole Vulkan thing is all about. This includes questions like, "does my graphics card support Vulkan?"
Does my graphics card support Vulkan?
If your graphics card meets the DOOM minimum requirements, it likely supports* Vulkan, but you’ll need the correct version of your GPU drivers in order to take advantage.

*Vulkan is not currently supported on NVIDIA GPUs with 2 GB of RAM on Windows 7 or on the GTX 690. Users with these GPUs need to run DOOM on the OpenGL graphics API.