Game Crashing - new pc build

So as game keeps causing pc to reboot I assume its power related, when I queried this it was suggested that I test for psu transient spikes. To do this I capped the frames at 90,  the logic being that uncapped framerates cause the GPU to draw maximum power instantly when rendering simple scenes (like menus or skyboxes), creating massive transients. Capping FPS smooths out these power requests. Consequently if the crashing stops completely when FPS is capped, the issue is almost certainly transient spikes overwhelming your PSU, confirming the need for a hardware upgrade or undervolting. 

So according to this either I have a faulty psu, improperly connected wires or I need to undervolt my GPU. Suprised that I may need to undervolt the gpu, not something I particularly want to do. What do you guys make of this? any other possible causes I should consider. Any input would be appreciated. 

Other suggestions:

 Battlefield 6 causing full system reboots is typically caused by Power Supply Unit (PSU) transient spikes, unstable RAM/CPU settings, or EA Anti-Cheat conflicts, rather than simple software bugs.

PSU Transient Spikes: Modern GPUs (like RTX 3080/4090) draw sudden power bursts that can trip the over-current protection on older or lower-quality PSUs, causing an instant hard reboot. Check Windows Event Viewer for Kernel-Power Event ID 41; if present, replace the PSU with a unit having high transient handling (e.g., Corsair HX series).

Hardware Instability: Unstable RAM XMP profiles or CPU overclocks often trigger crashes under BF6’s specific load.Try disabling XMP, setting RAM to default speeds (e.g., 3200MHz), or using Intel Extreme Tuning Utility to lower the Performance Core Ratio on 13th/14th Gen Intel CPUs.

Anti-Cheat & Driver Issues: Conflicts with EA Anti-Cheat can cause state locks. Try performing a full power drain (unplug PC, hold power button for 10 seconds) to reset hardware states. Additionally, update GPU drivers, disable ASLR for bf6event.exe, or switch display mode from Borderless to Fullscreen to resolve launch crashes.