Post will see 2 cpus. You may have to install a processor driver x64 bit driver found here
http://www.amd.com/us-en/Processors/..._13118,00.html
Hit ctrl alt delete and performance and if its working you will see 2 cpu graphs.
As for the raid array thats a good question maybe if you buy the se mobo or one with the same sata chipset maybe itll recognise it.Take a ghost image of the os first burn to dvd or spare hdd,then if you have to rebuild array just recover the ghost image bobs your uncle fannys your aunt