How much fps you got there?
Alpha was really screwed up for me. On i7 920, HD4890, lowest resolution and lowest settings i was getting like 20 constant fps.
Not enough fps to enjoy playing

My desktop has an I7-920 as well, but with HD5850. The alpha loved my desktop and ran 100% smooth even with everything on max, but other people with the same hardware had lags. I don't think you can judge the performance based on the alpha test.
I don't know how HD4890 compares to HD5850?
	
 

 
 Would guess it's CPU, but mine is i7 920 @ 3.66Ghz which is decent.
    		            							
 
 
 I'd await the beta and see how things go. I've heard Quinn Duffy say somewhere that performance has become 2,5x better since the alpha. 
    		            							
 
					
						
						
						
						
						
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