GTX 650Ti SLI VS GTX VS GTX660TI VS GTX670 VS GTX680

Specification	GTX 650TI X 2 SLI	GTX 660TI (New)	GTX 670	GTX 680
Model	GTX 650 TI (2GB DDR 5)	GTX 660 TI (2GB DDR5)	GTX 670  (2GB  DDR5)	GTX 680 (4GB DDR5)
Core Clock	1986 MHZ Base  / 2118 MHZ	928 MHZ Base  / 1006 MHZ	915 MHZ Base  / 980 MHZ
Core Processor	1536 Stream Processor	1334 Stream Processor	1334 Stream Processor	1536 Stream Processor
Memory Size	4GB DDR5	2GB DDR5	4GB DDR5	4GB DDR5
Memory  Type	DDR 5	DDR 5	DDR 5	DDR 5
Memory  Interface	384-bits	192-bits	256-bits	256-bits
Memory Clock	12016 MHZ	6008 MHZ	6008 MHZ	6008 MHZ
Multi Display	Upto 4 Monitor (Multi Display)	Upto 2 Monitor (Multi Display)	Upto 2 Monitor (Multi Display)	Upto 2 Monitor (Multi Display)
DVI Port	4  (2 X DVI-I, 2 X DVI-D)	2  (1 X DVI-I, 1 X DVI-D)	2  (1 X DVI-I, 1 X DVI-D)	2  (1 X DVI-I, 1 X DVI-D)
Dvi Support	Quad Link DVI Support	Dual Link DVI Support	Dual Link DVI Support	Dual Link DVI Support
HDMI	2 Port (1.4a)	1 Port (1.4a)	1 Port (1.4a)	1 Port (1.4a)
Display Port	2 Port	1 Port	2 Port	2 Port
Max Resolution	4096 X2160	2560 X1600	2560 X1600	2560 X1600
Interface	PCI-Express 3.0 X 2 Double Bandwidth	PCI-Express 3.0 X 1 Single Bandwidth	PCI-Express 3.0 X 1 Single Bandwidth	PCI-Express 3.0 X 1 Single Bandwidth
Cooler Type	Fan (Dual-Slot) X 2 = 4 Fans	Fan (Dual-Slot) X 1 = 2 Fans	(Dual-Slot) X 1 = 2 Fans	(Dual-Slot) X 1 = 2 Fans
SLI Support	Yes	Yes	Yes	Yes
PSU Watts	750 Watts	600 Watts	600 Watts	600 Watts
Direct X	Microsoft Direct X 11	Microsoft Direct X 11	Microsoft Direct X 11	Microsoft Direct X 11
Power  Connector	PCIe 2 X 6 - Pin	PCIe 2 X 6 - Pin	PCIe 2 X 6 - Pin	PCIe 2 X 6 - Pin
Weight	3.32	1.66	2.94	3.44
Price	24200/-INR	20600/-	32000/-	35000/-

My Opinion Is Go For Two GTX 650TI Graphics Card and Configure In SLI Mode Damn Its Batter Then all above