The AMD Phenom II X2 550, 3.1 GHz processor you have picked out is supported by the ASRock 890FX DELUXE3 board based upon the board's Supported CPUs
As an alternative, you might consider spending less on the motherboard and then splitting the difference by buying a CPU that has more cores; therefore, taking out the uncertainty on whether or not unlocking any disabled cores would work, and if it worked, if it would be stable.
In regards to the AMD versus Intel debate over which is better, I gave up my "fan-boyism" several years ago and traded it in for common sense, getting whatever processor was the best bang for my buck for my computing needs. Same goes with ATI versus nVidia, and any other computer hardware or software company you can think of; although, I am partial ot Lian-Li cases
. Currently I have a desktop computer that I built in 2004 with an AMD cpu and an ATI graphics card, but I have one laptop with an Intel processor and a nVidia graphics card. I am still kicking myself for buying WD Raptor harddrives back when I built my current desktop computer. Sure, they are fast, especially in a RAID 0 config...even for today's standards..., but were and are the two or three second quicker load times and write times really worth the price I paid?
In the end, what matters more than mine or any body's opinion, although most other's opinions are better than mine, is buy whatever makes you happy and you are satisfied will meet you computing needs.
Edited by MedStudent.003Hz, 13 July 2010 - 10:31 PM.