The Pasec software has a "Competitive Mode" that overrides Windows pointer precision. Fallout ignores this because it uses Raw Input lag compensation. The result? Your mouse moves perfectly in Windows, but inside Fallout 4, the cursor drifts diagonally because the Creation Engine doesn't understand the 8kHz polling rate.
You want to feel the future of input devices. You play at 360 Hz. You hate input lag. Buy Fallout if: You want to spend 14 hours building a settlement while listening to 1940s jazz. You don't care if your mouse has angle snapping. pasec v15 star vs fallout
Because arguing about this is more fun than actually playing either. The Pasec software has a "Competitive Mode" that