Why does the a78m e45 support x-fire but not sli?

joserope

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Dec 7, 2014
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i am planning to buy a PC build for xmas and was looking at my motherboard it said it didn't support SLI but it said it supported x-fire. My plan was to buy a 7770 and then, next christmas, buy 2 geforce gtx 750 ti ftw 2 gig gddr5 and crossfire them.
 

joserope

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Dec 7, 2014
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Will do, but what is the difference between SLI and x-fire?
I know they put 2 cards together to provide stronger graphics, but what's the difference?