Welcome to the forums, newcomer!
When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.
Since you state performing an upgrade, please state what parts you've upgraded and what parts were recycled from the older build.
have only increased the power limit, no overclocking
Why did you feel the need to manipulate the power limit on the GPU? Were you having instability issues out of the box?
Moved thread from Displays section to Systems section.
Hi thanks

CPU: 9800X3D
CPU cooler: Corsair H150i
Motherboard: MAG X670E Tomahawk
Ram: Corsair Vengeance 6000Mhz DDR5
SSD/HDD: Toshiba HDWD/Samsung 840 EVO/Samsung 970 M.2
GPU: 9070xt Sapphire Pulse
PSU: Corsair 750i, around 5 years old I think
Chassis: Lian Li, sadly don't remember make
OS: Windows 11
Monitor: MSI G27CQ4
I upgraded GPU, CPU, Motherboard, and Ram, everything else was recycled.
I increased power limit as it's just something I've done with all my previous GPUs to give them extra headroom that's all, no instability issues out of the box as far as I'm aware.
Edit
Also, I have two monitors plugged into my GPU, it's just my main monitor that shuts off, not the secondary one.