UPDATE December, 2018
Here you will find information about my PC rig, system and simulator settings. 
With those I am able to get smooth VC view with 25-40 fps in bad weather conditions at complex airports like EGLL, EDDF, OMDB.

A big THANK YOU I send to Ehab, a person who participated in this rig upgrade by sponsoring motherboard. 

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Motherboard: MSI Z370 Pro Carbon AC ATX ---> buy at US Amazon or UK Amazon or DE Amazon)
CPU: i5-8600K (overclocked to 4.9Ghz) ---> buy at US Amazon or UK Amazon or DE Amazon)
CPU cooler: EKWB Slim Kit EK-KIT 240 ---> buy at UK Amazon or DE Amazon)
RAM: G,Skill Ripjaws V 32GB (F4-3200C16D-32GVK) ---> buy at US Amazon or UK Amazon or DE Amazon)
GPU: MSI 1070Ti Armor (overclocked via MSI Afterburner - see pictures below) ---> buy at US Amazon or UK Amazon or DE Amazon)
PSU: Thermaltake Toughpower Grand RGB 750W Gold ---> buy at US Amazon or UK Amazon or DE Amazon)
Hard drives:
1. System / Simulator: Samsung 960 Evo 512GB (M.2 SSD)
2. Graphic projects: Samsung 850 Pro 256 GB (SATA SSD) ---> buy at US Amazon or UK Amazon or DE Amazon)
3. All other stuff: HDD: 2x1TB HDD (Samsung and WD) + 1TB HDD Toshiba (Backup)
Case: Phanteks Eclipse P400S Tempered Glass (Black) ---> buy at US Amazon or UK Amazon or DE Amazon)
Headset: Corsair VOID Pro RGB (Wireless) ---> buy at US Amazon or UK Amazon or DE Amazon)
Monitor #2: 49" Samsung CHG90 
Monitor #2: 27" Iiyama ProLite B2783QSU ---> buy at UK Amazon or DE Amazon)
System: Windows 7