PCI-e I assume? Crossfire, so you want 2 cards, right? Just go onto newegg.com and use the filters to show all the Crossfire capable cards with 512MB of memory. Then get the fastest card for your budget. Except in benchmarks, you really won't notice a difference in performance inside a game or app when comparing DDR3 & 4.
I would sya you would most likely want the gdd4 because its faster speeds which will help with rendering mybe, but dont go with what I say might be wrong
It is the better choice, because it will last longer having more ram than the 256 model. Also will be a standard in upcoming games. Honestly cant hurt to have more for a little $
i'd recommend waiting until later in the month when the new cards come out with the internal Crossfire system, unless you really want that dongle cable mess in the back of your system
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