I have seen many writeups on buying a mobo...
... of course >>
Max TDP of cpu should be considered.
VRM heatsinks for the VRM circuit.
8 pins EPS12V cpu power connector is a good idea.
I doubt if that is the first thing I think of though. In the mid-90s when I first began to go into forums on the net in search of what I was going to do with/for a computer, I met some of the 'old hands' and they told me the best thing to do was to actually look at the system specs/signature of the users I thought I most wished to run their speeds on my own system.
You have no idea how much money that has saved me. I seldom ever had the 'least' expensive system, but I also never had a really problematic system nor one that I felt was holding me back. Getting and in some cases not getting an awesome cpu and cooling was most often the only reason I could not run the big numbers.
I think to be honest close copy-catting of the fast runners has been my first look see into what I would buy. Review sites do not and most often cannot test a motherboard in a full and complete manner and they most often cannot just blast a POS if they wish to ever have more free units to test. So review sites likely only comprise less than 20% input into what I may well buy.
There is one other thing I might add as I have thought and written and that is to know one's ownself. This is fully inline with the people that told me to look and see how fast I wanted to run and copy the parts and pieces to run those numbers. So who am I? How fast do I think I 'need' to run down in my own 'gut'.
If you are a prospective AM3+ mobo user and come into the AMD motherboard section and state specifically what speed you want to run and how much you have to spend...the motherboard you bought would likely not be in your hands. One of us that help here all the time, would have positioned you quite differently I believe. That too is a form of copy-catting parts and pieces to run fast. Now there will always be that user that hops into a thread and says his X thing is awesome and fast and most of them I disregard. If they are unwilling to post a full set of system specs with appropriate backup images for validation...I disregard such out of hand.
So still thinking as I write; I get the idea and picture that respected, real world users will be my best place to get input into my parts and pieces choices. Then I might look to see what price I may have to pay, and are the recommends covering the bases of a board design I also like and go from there.
Sorry I did not answer with check this and check that. I actually wrote what it is that I do when buying computer parts. I do know myself as to what sort of speeds I want to run and mediocre parts just won't get that done for me. Or at least that is how it has worked for nearly 20 years.
Luck man.
RGone...ster.