ok im searching the web and bam ATI has a card with one gig of memory. im thinkin wow thats really cool but, can it possibly be worth the $1,500 asking price? wouldnt two 512 cards be about the same? and cheaper? ATI's x1900xtx is only $500 (of course ATI doesnt have sli as far as i know). nvidia makes cards that compete with it.... all im askin is do u think it would be worth the money to get a card with one gig of memory or will 512 be more than enough?