Be aware - there are NO "EATX" or any "*ATX" form factor dual xeon motherboards currently available on the market.
The Z9PE-D8 is an 'SSI EEB' (http://en.wikipedia.org/wiki/SSI_CEB) which has the same physical dimensions as an EATX but has additional standoffs, and drilling and mounting them yourself is required if not using an SSI EEB compatible case.
Look at the "Form Factor" here: http://www.newegg.com/Product/Product.aspx?Item=N82E16813131817
Here's a list of cases that are compatible: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007583&IsNodeId=1&Description=EEB&name=Computer%20Cases&Order=BESTMATCH
I like the Cosmos II, but, I have the room in my office...
I've been looking at building one myself, I personally decided to wait until the next gen Xeon's come out (just a few weeks away now, rumor has it). https://www.google.com/search?q=E5-2687W+v2
Good luck and may the multithreads be with you
The Z9PE-D8 is an 'SSI EEB' (http://en.wikipedia.org/wiki/SSI_CEB) which has the same physical dimensions as an EATX but has additional standoffs, and drilling and mounting them yourself is required if not using an SSI EEB compatible case.
Look at the "Form Factor" here: http://www.newegg.com/Product/Product.aspx?Item=N82E16813131817
Here's a list of cases that are compatible: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007583&IsNodeId=1&Description=EEB&name=Computer%20Cases&Order=BESTMATCH
I like the Cosmos II, but, I have the room in my office...
I've been looking at building one myself, I personally decided to wait until the next gen Xeon's come out (just a few weeks away now, rumor has it). https://www.google.com/search?q=E5-2687W+v2
Good luck and may the multithreads be with you