Not worth it
			 
			 
			
		
		
		
			
			SLI / Crossfire is not worth it. First you have to buy two or three cards, a good cooling solution. Then after a couple of years when you want to upgrade you have to buy two / three new cards again. It is like multiplying the costs.  
And very few games support sli / crossfire and does who do it is barely any difference at all. Some give you maybe 5 or 10 fps more.
		 
		
		
		
		
		
		
		
		
	
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