You want the 1gb card. The ddr3 is slower, and the thing is, you don't use the 2gb up until high resolution, but the thing is the ddr3 is slower, and the card is an entry level card and may not be able to take advantage of all that vram anyway. IE the ddr3 card is probably more of a marketing gimmick. I've got the GTS 450 myself, the 1 gb and it does fine on my 22 inch. I might suggest though, save a little more, and pick up a GTX 460 for not much more. Much faster card for only a little more $$.