The general consensus I found was that it does very little is basically everything, and a lot in heavily modded Skyrim. As Skyrim is the game I play most, and I still got VRAM overflow based crashes on my 2GB HD6950, I decided that while I was getting a new GPU anyway, there wasn't much point keeping the VRAM-overflow crashes.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT