Is this Ram FB-DIMM and will it work with this Mobo?

Like any computer part, it will be clearly labeled as to what type it is.
The one you linked to is not FB-DIMM, it is standard DDR2 SDRAM memory.

Here is a link to neweggs selection of FB-DIMM memory modules: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Description=fb-dimm&x=19&y=28

Also, you should really go the Intel website and verify which FB-DIMMs are certified for the Skulltrail board as server boards can be very finicky about memory, and it's usually best to follow the munufacturer's recommendations and go with memory that has successfully gone through the certification process.

Here is a link to the specs from Intel: http://www.intel.com/products/motherboard/D5400XS/index.htm
Best of luck!

Thanks man you really helped. I checked out the intel site and so far this ram seems to check out http://www.newegg.com/Product/Product.aspx?Item=N82E168... . Does it look good to you too for that board?

I don't have direct hands-on experience with the new dual-CPU systems, so someone with more experience will have to chime in for more definite answers, but, if it's on the list from Intel, it will work with that board.
Wish I could be of more help!

(*my last dual-CPU system was dual Pentium-III's (933-mHz each) on an Intel 810 board with a whopping 1-GB RDRAM from Kingston, so I am a bit out of the loop in this regard.)

Google is your friend  

Dont expect normal cases and psu's to work with high end/server based motherboards etc too