do i need dual graphics cards,

[sinderg]

hi all,

Im looking to upgrade my old 2x19" (UltraSharp 1908FP) monitors for 2X30" monitors.
ive chosen to buy 2 Dell™ UltraSharp™ 3007WFP-HC* 30-inch monitors.

but the do i need another graphics card for the 2nd monitor, i currently have just one Radeon X1950 XT which says it has dual dvi.

also will my motherboard be ok for a second graphics card ; its listed below
ASUS P5W DH Deluxe SKT 775 dual-core Core2Duo Conroe ready Crossfire 8channel audio ATX

also do i need to buy the same brand which is :PowerColor ATI Radeon X1950 XT Extreme SILENT Heatpipe 256MB GDDR3 VIVO TV-Out/Dual DVI (PCI-Express) - or can i buy any other ATI Radeon X1950 XT , do i need the 2nd to me some kind of special slave version or somthing.

im kind of clueless about graphics cards.

anyhelp would be great. thanks in advance