The GeForce website now offers new version 337.50 beta Windows drivers for GeForce graphics cards (thanks Iggy). These promise significant performance improvements under certain circumstances. Here's word:

Performance - Introduces key DirectX optimizations which result in reduced game-loading times and significant performance increases across a wide variety of games. Results will vary depending on your GPU and system configuration. Here are some examples of measured gains versus the previous 335.23 WHQL driver:

GeForce GTX 700 Series (Single GPU):

• Up to 64% in Total War: Rome II
• Up to 25% in The Elder Scrolls V: Skyrim
• Up to 23% in Sleeping Dogs
• Up to 21% in Star Swarm
• Up to 15% in Batman: Arkham Origins
• Up to 10% in Metro: Last Light
• Up to 8% in Hitman Absolution
• Up to 7% in Sniper Elite V2
• Up to 6% in Tomb Raider
• Up to 6% in F1 2013