Also you should remember that the ingame lag depends on how much RAM you have for the files to record. At full resolutions every 5 minutes is around 2 GB.
Having a fast-writing HDD is crucial for lagless HD recording.
Game/3D Recorder: Gregion http://www.gregion.com/game/manual/64.html
Supports DirectX, Direct3D, OpenGL and more.
Can reccord/compress real time or just raw.
Easy to use.
Light
Good quality