Gpu Usage Flickering

I am getting a very spikey GPU usage, core clock and memory clock. Just whilst idling on my desktop. i have a i5 10400F, 16GB DDR4 RAM, Windows 10, And a RTX 4060 in an RM550X power supply, i get huge GPU usage dips in games, dropping down to 5 percent (and 5fps) around every 3 to 5 seconds...

My Laptop specs are : CPU: i5-7200U GPU: Radeon r5 m330 (2gb ddr3) RAM: 8 GB single channel 500 GB WD Blue SSD Why gaming, the FPS suddenly drops from 60 to 1-10, and after 5-10 seconds, it comes back to normal. But this issue is happening frequently, almost 1 min interval, making games...