AB350Pro4 - Bad PCIEx16 slot

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   Hello all,

I have been banging my head to find the root cause of the audio stutters, fps drops, freezes on my new PC build (https://pcpartpicker.com/list/cxMqFd). The mouse pointer also lags even when pc is idle. I am not sure if the PCIE2 slot is bad or if the PCI-e controller in CPU is bad.

This lag/stutter happens ONLY when the GPU is seated in the PCI-E 3.0 x16 Slot (PCIE2: x16 mode) slot. When I re-seat the GPU into PCIe 3.0 x16 Slot (PCIE4: x4 mode), the lag/stutter go away and gaming is smooth.

Below are the things that I tried to find root cause when GPU is in PCI-E 3.0 x16 Slot (PCIE2: x16 mode) slot

When LatencyMon is ran when PC is normal, the ISR and DPC numbers (nearly 25000µs) are high. Results are below. I have tried everything possible solution provided on the internet to fix dpc/latency issue but nothing fixed my problem.

LatencyMon results in Imgur album - https://imgur.com/a/11fme

Things I have tried:

1. Windows 10 reinstall and disabled driver auto update
2. DDU nvidia drivers and reinstall only GPU driver (didnt install HD audio driver or anything else)
3. Install Ethernet driver from mobo vendor & install latest ethernet driver from manufacturer
4. Tried installing Realtek audio driver 
4. Disable HD audio driver from device manager and disabled HD audio from bios
5. Disable C-states from bios
6. Disable HPET from bios
7. Set gpu and system at max performance
8. Set dynamic tick command (cant remember the command)
9. GPU and CPU temps are normal ~80c and ~45C under high load respectively.

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NightKing Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Oct 2017 Status: Offline Points: 20	Post Options Post Reply Quote NightKing Report Post Thanks(0) Quote Reply Posted: 11 Oct 2017 at 2:09am
	Hello all, I have been banging my head to find the root cause of the audio stutters, fps drops, freezes on my new PC build (https://pcpartpicker.com/list/cxMqFd). The mouse pointer also lags even when pc is idle. I am not sure if the PCIE2 slot is bad or if the PCI-e controller in CPU is bad. This lag/stutter happens ONLY when the GPU is seated in the PCI-E 3.0 x16 Slot (PCIE2: x16 mode) slot. *When I re-seat the GPU into PCIe 3.0 x16 Slot (PCIE4: x4 mode), the lag/stutter go away and gaming is smooth.* Below are the things that I tried to find root cause when GPU is in PCI-E 3.0 x16 Slot (PCIE2: x16 mode) slot When LatencyMon is ran when PC is normal, the ISR and DPC numbers (nearly 25000µs) are high. Results are below. I have tried everything possible solution provided on the internet to fix dpc/latency issue but nothing fixed my problem. LatencyMon results in Imgur album - https://imgur.com/a/11fme Things I have tried: 1. Windows 10 reinstall and disabled driver auto update 2. DDU nvidia drivers and reinstall only GPU driver (didnt install HD audio driver or anything else) 3. Install Ethernet driver from mobo vendor & install latest ethernet driver from manufacturer 4. Tried installing Realtek audio driver 4. Disable HD audio driver from device manager and disabled HD audio from bios 5. Disable C-states from bios 6. Disable HPET from bios 7. Set gpu and system at max performance 8. Set dynamic tick command (cant remember the command) 9. GPU and CPU temps are normal ~80c and ~45C under high load respectively.