List of Quad Core optimized games.

Note:It is important to note that these games offer a serious performance increase when upgrading to a quad core from a dual core,and not from a triple core.

1.       ARMA 2 (confirmed)

2.      
Aliens vs Predators (unconfirmed)

3.      
Anno 1404 (confirmed)

4.      
Assassin's Creed 2 (unconfirmed)

5.      
Batman Arkham Asylum (confirmed)

6.      
Battlefield Bad Company 2 (confirmed)

7.      
Brother in Arms: Hells Highway (confirmed)

8.      
Call of Duty Modern Warfare 2 (unconfirmed)

9.      
Call of Duty World at War (confirmed)

10.  
Company of Heroes series (confirmed)

11.  
Devil May Cry 4 (confirmed)

12.  
DIRT 2 (confirmed)

13.  
DIRT (unconfirmed)

14.  
Dragon Age: Origins (confirmed)

15.  
Empire Total War (patch 1.3) (unconfirmed)

16.  
Far Cry 2 (confirmed)

17.  
Flight Simulator x (confirmed)

18.  
Football Manager 2010 (unconfirmed)

19.  
future Source Engine games(confirmed)

20.  
future Unreal Engine 3 games(confirmed)

21.  
Grand Theft Auto IV (confirmed)

22.  
GRID (confirmed)

23.  
HAWX (confirmed)

24.  
Left 4 Dead 2 (confirmed)

25.  
Left 4 Dead (confirmed)

26.  
Lost Planet 2(confirmed)

27.  
Lost Planet (confirmed)

28.  
Medal of Honor Airborne (confirmed)

29.  
Operation Flashpoint 2:Dragon Rising (unconfirmed)

30.  
Prince of Persia (unconfirmed)

31.  
Prototype (confirmed)

32.  
Red Faction: Guerrilla (unconfirmed)

33.  
Resident Evil 5 (confirmed)

34.    
Shattered horizon (confirmed)

35.  
Stranglehold (confirmed)

36.  
Supreme Commander 2 (confirmed)

37.  
Supreme Commander Forged Alliance (confirmed)

38.  
Supreme Commander (confirmed)

39.  
The Last Remnant (unconfirmed)

40.  
The Sims 3 (confirmed)

41.  
Tomb Raider Underworld (unconfirmed)

42.  
Unreal Tournament 3 (confirmed)

World in Conflict (confirmed)

The list is outdated. If you are aware of any other games that grant a hefty boost to FPS using a quad core, please add the name in the comment section.