What motherboard should i get?

i have a 5th gen xps, the motherboard in it is no good anymore, i was wondering what a good replacement would be? it has Intel® Pentium® 4 Extreme Edition, dual processing i believe, i do a lot of photography editing, and gaming, i would like something that could still use the type of ram thats in it, i was looking at a 9800 gx2 but it uses ddr3, any help would be nice, thanks

sorry i'm kinda new to computers, i was thinking the wrong thing when i posted, i meant to ask if the 790i ultra sli would work with what i have now, with the 2GB ram i have, and the 2 geforce 6 series gpu's (6800 i believe, model260)
the specs for my computer are here http://support.dell.com/support/ed [...] #wp1052939

if i had to redo my computer what would be a good cpu, mb, ram and anything else i might need? i do tons of pictures, and gaming, and watch movies

okay, the specs must be for a different gen, because i looked it over and found the sticker saying pentium 4 on it, i looked up the 5th gen specs but all i could find was that it had was a single Radeon X800 XT PE, mine has dual gpu's in it, this is were i found the info http://www.trustedreviews.com/pcs/ [...] ming-PC/p1