Can your hardware run it?
We read what the browser will tell us — the WebGL renderer string, the memory hint, the platform — then you confirm. Nothing leaves the page: detection runs in your browser and the only thing we ever receive is the device you pick.
Detection is a best guess. Browsers mask the renderer string in private modes and in Safari, and none of them report VRAM at all — we infer it by matching the renderer name against the device table. Check both flagged fields before trusting the numbers.