I am going to purchase some new GPU's for use with Iray and I was just curious how IRay will handle dual GPU units on a single board like the new Nvidia gtx 590. My main concern is how it will handle the memory. This card has a total of 3GB of memory but because its a dual GPU card is IRay going to treat it basically like two seperate 1.5GB cards or like one 3GB card? My main concern is that 1.5GB might be to small for some of my scenes but I figured that even though the card is all on the same PCB it is still going to treat it like two 1.5GB drives and not allow me to load larger scenes. Any further verification on this would be appreciated. THanks.