Fix PCIe Interrupt Conflicts – Stop Microstutter in Games

Ever notice your FPS is fine, but frametimes are spiky or GPU usage randomly dips? That’s usually NOT your GPU — it’s your PCIe bus choking on interrupt conflicts. By default, Windows and motherboard firmware assign interrupts poorly — your GPU ends up sharing IRQ lanes with SSDs or NICs. The result: microstutter, input delay, and FPS drops. ⚡ In this guide, I’ll show you 5 steps to proper PCIe optimization: 🛠️ What You’ll Learn ✅ Set GPU priority with MSI Utility v3 (properly, not just “tick the box”) ✅ Force and fine-tune Resizable BAR (ReBAR) with NVIDIA Profile Inspector ✅ Disable PCIe ASPM power throttling via Registry ✅ Apply deep registry fixes: Interrupt Steering + Payload Size ✅ Clean up hidden IRQ conflicts in Device Manager 🔑 Key Commands Kill ASPM (no PCIe power throttling): [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pci\Parameters] "EnableASPM"=dword:00000000 Force stable interrupts: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\PnP\Pci] "InterruptSteeringDisabled"=dword:00000001 Increase payload size: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pci\Parameters] "MaximumPayloadSize"=dword:00000200 ; (512) 🚀 Results You Can Expect ✔️ Flatter frametime graph (goodbye spikes) ✔️ No more random GPU usage dips ✔️ Less PCIe bottlenecking under load ✔️ Smoother gameplay in all titles 💬 Drop your GPU + motherboard model in the comments if you’re unsure about IRQ conflicts — I’ll help you fine-tune it. 👍 Smash Like if this guide helped & 🔔 Subscribe for more real optimization guides.