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Doom Eternal can run at 1,000 fps on liquid nitrogen cooled PC, tested with Core i7 9700K & RTX 2080Ti

When DOOM Eternal was in development, Id software’s lead engine programmer said that id Tech 7 engine powering Doom Eternal could run at 1,000 fps, on a powerful enough PC. A team lead by Polish hardware retailer x-kom has now managed to play Doom Eternal at 1000 FPS as part of QuakeCon.

Extreme high framerates like 1000 fps aren’t anywhere close to practical for typical usage, but the Polish Overclocking Team ‘x-kom’ took on the 1K challenge, overclocking both an Intel i7-9700K to 6.6GHz and an ASUS ROG Strix RTX 2080 Ti to 2.4GHz under liquid nitrogen/LN2 cooling to achieve this feat. Bethesda recruited the Polish hardware retailer x-kom to figure out how to run Doom Eternal at 1,000 frames per second.

As you can see in the Video below, Piotr “Lipton” Szymanski and Marcin “Ryba” Rywak managed to play DOOM Eternal at 1,000 FPS, pushing the limits of id Tech 7 engine.

DOOM Eternal: The 1K FPS Challenge

id Software said that this was originally intended as a theoretical statement, to check the scalability of the id Tech 7 engine, but it appears that now they’ve decided to put this theory into practice. To manage this high overclock speed they had to use a Liquid Nitrogen/LN2 cooling solution, for stability, since normal heatsink and thermal paste won’t do the job. This was done by experienced overclockers, and is not recommended for anyone else, other than qualified experts. Not for daily practical usage, since using LN2 can be very dangerous, if mishandled. Nonetheless, with this massive overclock, they were able to hit the 1000 FPS target, in fact 1014 fps during a tutorial map.

Bethesda and the polish hardware retailer ‘x-kom’, first assembled a PC equipped with an Intel i7 9700K, ASUS RTX 2080Ti, HyperX Predator RAM, a Samsung M2 SSD and BeQuiet 1200W power supply. But this system could only provide 500-600 FPS, so a liquid nitrogen cooling system was required to hit the 1000 FPS target.

Here are the specs used:

  • CPU: Intel Core i7 9700K @ 6.6GHz
  • Motherboard: ASUS Maximus XI APEX
  • GPU: ASUS RTX2080Ti Strix @ 2.4GHz
  • RAM: HyperX Predator 4000MHz CL19 2x8GB
  • Drive: Samsung 512GB M.2 NVMe Evo Plus
  • Power: Be Quiet 1200W Straight Power

It appears that the refinements that were made to the ‘job system’ in id Tech 7 engine, also allowed the game to use all the available CPU cores more efficiently.  As you can see in the Video, the overclockers first took apart the RTX 2080 Ti and then applied some viscous stuff all over it. This was done to protect the PCB circuit, so that Thermal Grizzly Kryonaut, which is a non-conductive thermal paste that works at minus-zero temperatures, can be easily added to the GPU die for better conductivity, and liquid nitrogen can then be added into the mix (without any danger or risk).

“On day two, the moment of glory finally came. The DOOM Slayer was walking through the opening corridor of DOOM Eternal’s “Hell on Earth” level when all eight CPU cores clocked at nearly 6.6GHz, and the frame meter registered exactly 1,006 frames per second. It even went up as high as 1,014 FPS during a tutorial map, exceeding the 1,000 FPS goal with frames to spare.”

Check out this full blog post for more details on how the OC team managed to get Doom Eternal running at 1000 fps, and the hardware/setup used to accomplish this task. It is really impressive!

Doom Eternal 1000fps