I merged two working PCs into one system. The current build uses a Ryzen 7 5700X3D, ASRock B550 Phantom Gaming motherboard, 32GB of Corsair Vengeance DDR4-3600, and an ASUS TUF RX 7800 XT. Before the change, both computers worked normally. Since moving the CPU and GPU into the B550 system, every game has severe stuttering about once per second, even when the frame rate is extremely high.
For example, Supermarket Together reports over 400 FPS, but it still feels very choppy. Limiting the frame rate to 100 FPS to match my monitor does not help. The same problem occurs in Dead by Daylight, Detroit: Become Human, Minecraft, and other games. I have already disabled fTPM, enabled Above 4G Decoding and Resizable BAR, and used DDU before installing the latest AMD graphics drivers.
The Windows installation is from the original B550 system and has previously been used with the GTX 1080 and Ryzen 5 5600. Could this be caused by the old Windows installation, a BIOS or motherboard setting, incorrect PCIe slot placement, memory instability, or failing hardware? What should I test first?
3 Answers
Since you moved the CPU and graphics card between systems, start with the basics: make sure the RX 7800 XT is installed in the motherboard's top PCIe x16 slot, the one closest to the CPU. The lower slot may have much less bandwidth. Also check for a newer BIOS, because an updated AGESA version may be needed for the Ryzen 7 5700X3D. DDU followed by a fresh AMD driver install was the right step, but BIOS and slot placement can still cause this kind of frame-time stutter.
Try putting the GTX 1080 back in temporarily. If the stuttering disappears, the issue is probably related to the AMD card, its driver setup, or a hardware fault. Since the current Windows installation was configured around different hardware, testing with the clean Windows installation on the other SSD would also be useful. If the clean system runs smoothly, reinstalling Windows and the chipset and graphics drivers on your current drive is probably the fix. If the stutter remains, investigate the GPU, storage, RAM, and temperatures.
The very high FPS suggests this is a frame-time or system-latency problem rather than a lack of rendering performance. A clean operating system install is one of the quickest ways to separate software from hardware issues. Before doing that, update the motherboard BIOS and AMD chipset drivers, confirm the RAM is stable, and monitor temperatures and clock speeds. If the hitch happens at a regular interval, a latency-monitoring tool can help identify a driver or background process causing periodic spikes.
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