Okey guys.
I spent a hour searching and reading all relevant topics for my problem but still I didn't find a solution. I have an AMD FX-8350 Cpu on stock clock with EVO 212 Cooler, Gigabyte GTX 1060 6G, Crucial DDR3 1600Mhz 8GB RAM and Gigabyte GA-990x Gaming SLI MB. I am using Windows 10 64-bit. I am experiencing huge FPS drops especially in newer games like CoD WW2 after a while. I locked framerate to 75 FPS and then it's randomly dropping at first to 50 FPS and then 40 and less. CPU temperature isn't higher than 55 °C and GPU is at 80°C with automatic fan speed but I've found out that if I am playing in cold room (20 °C without radiator on) it's not dropping that much, so I suspect some temprature problems even though the temps are not that high. I tried switching off all energy saving modes for CPU in BIOS but there's almost no result. I have this case: https://www.czc.cz/silentiumpc-regnum-rg1-pure-black-cerna/188046/produkt?gclid=EAIaIQobChMI-M-v5re81wIV1zLTCh2vRAZyEAQYBSABEgIqWfD_BwE and I added extra 3 fans inside the case for extra airflow and again - no result. I also thought it could be bottlenecking but on extra settings in CoD without FPS limitations I can get about 100+ FPS, so normal and 75 should be fine... Any ideas? I saw guys with worse PCs playing without problem so I am really confused now... And before you will tell me to throw away AMD and buy Ryzen on Intel - I am already sparing money for Coffee Lake but with our small income in Czech Republic I need to wait little bit longer and I am trying everything to make this rig run properly. Thanks in advance!
P.S. I am in dormitory and I will get to my PC on thursday, so write me please some ideas and then I will try them all. And also sorry for my English, I am just a Slav guy learning from games and TV