I'm trying to determine which processes/threads are spiking up CPU usage. The scenario is the following: I'm playing games on my XPS 9560 (suffers from power limit throttling). I've made a mod that mates the VRMs to the heatsink and it worked great in keeping the processor boosted to 3.1-3.2 constantly in games until yesterday. The game I'm seeing this issue on is VALORANT, which is supposed to run only on one CPU core. While that is happening (i.e. only one CPU Core is active), I see constant speeds of 3.3-3.4 GHz in-game. But at some point, the active core count spikes up to 4 cores, which also brings power limit throttling with it, and a drop to 1.1 GHz.
I'm trying to determine what process is randomly spiking up CPU core usage and bringing power limit throttling with it. Is there a tool for that?
This is a screenshot of XTU:
The dark blue line is frequency, light blue is power limit throttling, and orange is active core count. Any help would be greatly appreciated. Thanks in advance.