Asus g73sw vcard

hi, im a new member
i just bought a asus g73sw-xc1 1900x1080p version and i want to install on it a nvdia gtx 560 or even a gtx 660

does someone know if i can do it?

and here are more specs of the lap

Operating System
Windows 7 Home Premium 64-bit
CPU Type
Intel i7-2630QM (2.0GHz)
Screen
17.3" LED
Memory Size
6GB DDR3
Hard Disk
750G 7200RPM
Optical Drive
DVD±RW/CD-RW
Graphics Card
Nvidia GTX 460M 1.5G GDDR5
Other Features
USB 3.0 Compatible
CPU

CPU Type
Intel Core i7
CPU Speed
2630QM(2.00GHz)
CPU Support
6MB L3 Cache
Display

Screen Size
17.3"
Wide Screen Support
Yes
Resolution
1920 x 1080
LCD Features
LED backlight
Operating Systems

Operating System
Windows 7 Home Premium 64-Bit
Graphics

GPU/VPU
NVIDIA GeForce GTX 460M
Video Memory
Dedicated 1.5GB
Graphic Type
Dedicated Card
Hard Drive

HDD
750GB
HDD RPM
7200rpm
Memory

Memory
6GB
Memory Speed
DDR3