Hitman: Absolution
Hitman: Absolution sees our stealthy, classy, and barcode-laced baldie Agent 47 swing back into action, only this time he's on the wrong side of the line with his former handlers.
The game uses a rehashed version of Square Enix's Glacier 2 engine that supports DirectX 11 and is able to render large crowds without much overhead.
At 2560x1600 the game would not go past the loading screen.