Upgrading video card

So I have an Alienware Aura R3
Mainboard : Alienware 046MHW
Chipset : Intel P67
Operating System : Windows 7 Home Premium Home Edition Media Center 6.01.7601 Service Pack 1 (64-bit)
Processor : Intel Core i7 2600 @ 3400 MHz
Physical Memory : 6144 MBDDR3-SDRAM
Video Card : NVIDIA GeForce GTS 450 x2 SLi
PSU : 525w

CAn I upgrade video card to MSI N660 Ti PE 2GD5/OC GeForce GTX 660 Ti 2GB 192-bit GDDR5 Video Card or to the MSI N670 PE 2GD5/OC GeForce GTX 670 2GB 256-bit GDDR5 Video Card
 
Yeah you can, any current generation card will work (except the GTX 690 and 7990 because your PSU won't be able to handle those). Should be quite a considerable upgrade over your current GTS 450 SLI setup.
 
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