From what I have read unless you are going to spend the big bucks for 2 top of the line video cards to use "crossfire" you will get better performance with 1 really good card as opposed to 2 lesser cards in crossfire.
Most people think that if they have 2 video cards thier video performance is going to be doubled.
That is not the case.
From what I have read 2 GOOD video cards in crossfire will give roughly a 25% increase in video performance.
Not a cost effective gain !
As for the idea of buying 1 video card now & another later for crossfire , usually , by the time "later" rolls around there will be newer video cards & 1 of them will out perform the 2 older cards in crossfire.
If you can not afford, or just don't want to spend the money on, a matched set of good video cards [wich will cost as much , if not more then a X2] I suggest you get the best single video card you can & let it ride.
As for why some motherboards cost more then others,
Some have features others don't .
Features cost $
I went from a $80. board to a &120. board just to get RAID.
Also, "mainstream" boards cost less then high end "enthusiest" boards aimed at "hard core" gamers & overclockers.
Edited by fairjoeblue, 17 July 2009 - 02:34 PM.
OCZ StealthXstream 700W,Gigabyte GA-EP45-UD3R , E8500, Arctic Freezer Pro 7, 3GB G.Skill PC8500,Gigabyte Radeon HD 4850 OC [1GB ], Seagate 250GB SATA II X2 in RAID 0, Samsung SATA DVD burner.