lizhu27

Ok it seems that I've managed to fix the polling rate problem. What I did is going to the bios settings ->advanced settings-> CPU configurations ->Disable C states>save and exit. Now my mouse polling rate is set at 1000hz, no stutter/fps drops at all in any games. Hope this helps.

I haven't encounter any problems with the mobo LEDs yet. I'm using ASRock PolychromeRGB v1.0.38. Have you installed SSE and checked the polling rate on your Rival 600 see if its 1000hz?

The issue is very likely caused by Z390 Taichi/9900k. I just built a new rig with the said parts this week, and I'm experiencing the same polling rate -> fps drop issue. It seems a quite common problem with the z390 chipset, or the Asrock/Taichi product line as I discovered someone experienced same issue with his z270 Taichi. Do you see any differences after switching to Rival 600? I'm using Rival 500 with 1000hz polling rate. Mouse movement causes cpu spikes which leads to fps drops in games like League of Legends and GW2. Haven't try my previous Scimitar but I assume there won't be any difference as my older Rival 500 (replaced because of sidebutton double click), which operates flawlessly on my previous build, has issue on this build. The problem really seems to related to the mobo and cpu. Fractal Meshify C ASRock Z390 Taichi - updated to BIOS ver 2.0, no fix 9900k Gigabyte 1080 G1 Corsair Vengeance RGB pro 8gb*4 970 evo plus 1tb m.2 Kingston HyperX savage 500gb sata ssd Seagate 2tb hybrid k68 rgb mx blue SS Rival 500 SS Arctis Pro wireless