Hi, thanks for answering! I clean it a couple of times a year with some compressed air. I specifically cleaned it a couple of days ago just in case. It never comes out very dirty. Temps are as usual, around 40ºC on idle and around 60ºC under heavy load/gaming. While running Unigine Heaven both temps and clock seem normal over several runs, which puzzles me as performance is almost 50% less than expected.
I just contacted with Nvidia support today and after running both GPU-Z and CPU-Z the support guy told me that the slowdown is because the 1080Ti is running on PCI 2.0 instead of 3.0. I can´t remember switched from 3.0 to 2.0 ever and the rig was running just perfect a week or so ago. Anyway, at booted to bios and I can´t find 3 or 2.0 anywhere. Only options available under PCI are: "PCI Latency Timer" which is set at 32 and "Above 4G Decoding" which is set to Disabled. I tried with other values in both fields to no avail.