The official requirements were posted to Steam.
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343 Industries have updated the PC requirements for Halo Infinite on the game's official Steam page. Time to see if your rig will be able to run Halo Infinite when it (presumably) launches on December 8, 2021.

MINIMUM:
  • Requires a 64-bit processor and operating system
  • OS: Windows 10 RS3 x64
  • Processor: AMD FX-8370 or Intel i5-4440
  • Memory: 8 GB RAM
  • Graphics: AMD RX 570 or Nvidia GTX 1050 Ti
  • DirectX: Version 12
  • Storage: 50 GB available space
RECOMMENDED:
  • Requires a 64-bit processor and operating system
  • OS: Windows 10 19H2 x64
  • Processor: AMD Ryzen 7 3700X or Intel i7-9700k
  • Memory: 16 GB RAM
  • Graphics: Radeon RX 5700 XT or Nvidia RTX 2070
  • DirectX: Version 12
  • Storage: 50 GB available space
PC Settings & Optimizations:
Halo Infinite is built for PC. From advanced graphics settings, ultrawide/super ultrawide support and triple-key binds to features like dynamic scaling and variable framerates, Halo Infinite is the best Halo experience on PC to date.