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Frame stutter problem

I’m experiencing an intermittent frame stutter issue in games as varied as World of Warships and Ghost Recon Breakpoint. It’s not tied to graphics quality settings, as I’ve tried everything from maxed out to turning them down to mud, and still have the issue. I’ve tried killing all background apps/processes, I update regularly, whether BIOS, drivers, or firmware. I’ve tried stock voltages, PBO enabled, Ryzen Master OC, and so on but can’t resolve it.

I built my PC in November 2019 – key specs are Gigabyte Aorus Ultra X570 MB, AMD Ryzen 3800X CPU, 32GB (4x 8GB) DDR 3600 RAM with XMP enabled, plenty of cooling, 2TB Seagate Firecuda PCIe 4.0 OS drive, 1TB Samsung 970 Evo PCIe 3.0 auxiliary drive, 2x 3TB Seagate mechanical drives in RAID 1, Windows 10 Home, and I reused my GeForce GTX 1080 Ti from my old rig. My temps are all far below the max thresholds during gaming. I