Hi i have a core i7, 6gb ram ddr3 and a gtx 275 and i recently got gta 4 and about 20 or 30 minutes i started playing an error pops up saying i tun out of video memory, i am playing with settings almost maxed... not maxed at all. My version of gtx 275 is the one with 896 mb. I run the game but taking care that the indicator in the video options is green and not orange or even red. What could be happening?