UPDATE 3:
BAD NEWS!
Windows 7 HP SP1 didn't help in anyway. =(
I did a fresh install of Windows 7 with formatting previous OS drive (C
, then installed all the necessary Win7 (x64) service updates and drivers: GPU, LAN, Audio, Chipset, SATA, NVMe SSD, DirectX & Visual C++. Configured NVIDIA driver to previous Win10 config, reinstalled MSI AB & RTSS and load custom profiles from my backup.
Also, I've cleared CMOS and reconfigured UEFI with the following "Custom Default" settings:
- Enabled #1 XMP, Sync All Cores "Auto"
- Configured fans
- Change PCIEX4_3 & M.2_2 to X4 speed
- Disable unnecessary SATA ports, fans, lights and other garbage
Windows 7 changes:
- High Performance Mode
- Disabled all the startup items
- Disabled built-in AV and firewall
- Disable all reminders in Action Center
In GTA 5 (no FPS cap) I've noticed the same issues with frame time spikes and drops when pressing RMB when being in a vehicle. With capped FPS there were no problems as before installing Win7.
In The Witcher 3 I noticed almost constant 100% GPU utilization and the same spikes. On Win10 there weren't such a frequent MAX GPU utilization, only in high loaded areas.
Now, I'm pretty scared of all this cr*p even in well run Win7 OS.
GTA 5 logs: https://drive.google.com/open?id=15NAhU33h4mXKBqXfU6aOGq4aMlPRBFgs
The Witcher 3 logs: https://drive.google.com/open?id=1-9U66th5eAAnMJd9hrkjZCHxTUISKG-T
Any advice, if possible in such a creepy situation?