Hi, I purchased a new monitor with 1440p and G-Sync (previous was 1080p and without G-Sync). I also purchased a new GPU, the Palit GTX 1070 Super Jetstream with 8 GB (previous was Gigabyte GTX 780 Windforce with 3 GB). I am using a Z97-A Motherboard, Intel i5 4690K, 16 GB RAM, Win 7 Prof. x64. and a Samsung SSD. After installing the new GPU, I installed the latest nvidia drivers. It did not feel like a lot has changed, I tried several games and reached bad results, e.g. Fallout 4 on medium settings, approx. 35 fps. Warhammer Total war only 30 fps, Witcher 3 only 25 fps. So I tried to use DDU, downloaded it, booted in safe mode, applied it and then installed all drivers again. The result was awesome, Fallout 4 on highest settings over 70 fps, Total War about 80 fps, Witcher 3 over 60 (on Ultra). The strange thing is now that these results declined overtime after rebooting the PC a couple of times. e.g. instead of 80 fps, Total War reached only 60 (with same settings). At the moment it is back to about 25-30 fps. I have no clue why it behaves like this. THe GPU has a GPU CLock of 1633 MHz (Boost: 1835). When watching it in GPU-Z, I saw the values "GPU Core Clock" and "GPU Memory Clock" reaching about 1999 MHz. Isn't this too high? I ran out of ideas how to fix this Can anybody help? Thank you.