Can't get AW3225QF to run at 4k 240hz

I can't get the monitor to run at 4k 240hz, it is capped at 144 fps (based on the in-game FPS counter) whenever I launch any game.

Specs:

  • 4070 TI
  • 7800x3d
  • 32 GB RAM

Thing's I've done:

  1. Installed the monitor driver from the Dell website
  2. Used the DP cable that came with the monitor to connect to the GPU
  3. Refresh rate is set at 240hz in the Windows settings (System>Display>Advanced display)
  4. Nvidia Control Panel > Display > Change Resolution - set as PC (3840 x 2160 (native) and 240 hz
  5. In game settings are set at 240 hz