What is the real difference in these motherboards all info appreciated
http://www.newegg.com/app/ViewProductDesc.asp?description=13-131-449R&type=Refurbish
http://www.newegg.com/app/ViewProductDesc.asp?description=13-131-464R&type=Refurbish
http://www.newegg.com/app/ViewProductDesc.asp?description=13-131-449R&type=Refurbish
http://www.newegg.com/app/ViewProductDesc.asp?description=13-131-464R&type=Refurbish