How to fix PCIe bandwidth issues on Colorful B450M-T M.2?
I started seeing these massive, ugly color blocks flickering across the dashboard, and it got way worse whenever I hit high speeds. Digging into the logs, the PCIe 3.0 lanes on my Colorful BATTLE-AX B450M-T M.2 V14 were hitting latency spikes of 110-135ns during heavy data requests. I tried forcing 'Prefer Maximum Performance' in the GPU drivers, but the flickering still popped up every 15-20 minutes, which was incredibly frustrating. I decided to risk a BIOS update to the latest version and manually locked the PCIe link speed to Gen3 instead of leaving it on Auto. Running a GPU-Z bandwidth test, the read speed jumped from 12.4GB/s to 15.1GB/s, and the flickering completely vanished. I actually bricked the boot process once during the flash because of a power flicker, but a CMOS clear brought it back to life. The chipset is now idling at 48-54℃ and RAM is steady at 3200MHz. Ran three passes of MemTest86 to be sure, and everything is clean with temps sitting at 48-54℃.
