As the title states, I want to find out the difference between these 2 motherboards. My current motherboard has died so I am looking for a new one and these are right up my alley. One is a ASUS H97M-E/CSM Motherboard ( http://www.superbiiz.com/detail.php?name=MB-H97MESM&c=CJ ) and the other is a ASUS H97M-E/CSM/C/SI Motherboard ( http://www.superbiiz.com/detail.php?name=MB-H97MESI&c=CJ ). The only difference i can spot is the 1st one only has /CSM and the 2nd one has /CSM/C/SI at the end of the model name. What does all of that mean and does it really matter? Another difference is the 2nd one is like $3 cheaper than the first. This may be a really dumb question but if you could help me out that would be great 
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