I have 2x BFG 9800GT OC 512Mb as seen in my sig below. My question it this. Will the BFG 9800GT OC 1gig card work with my same card w/only 512Mb. i.e. both cards would be identical except one would have twice as much ram. Would that cause any problems or do I have to match the amount of ram when Using the two in SLI mode?