In the early part of the week I will be heading back to the place I bought the Mac Pro from and look around to see if maybe they have an DP board laying around. Thing is, I've been reading that running an processor board from a 5,1 in a 4,1 Mac Pro can cause the fans to rev all the way up. So I was curious, are there any visual differences between the 4,1 and 5,1 processor boards? Are the copyright dates different? (2009 or 2010?) Anything just so I can look and know its the right one? Thanks!