Yes welcome to my world, it seems this patch has trouble with SLI and 590's, heres a quick fix that may help. The reason the flicking is occurring on my end, is because any time I set advance settings, these crazy artifacts occur, so what you do is go to graphics in settings, set them first to high, then go to advanced , not sure, but if we have the same problem, PP is automatically set to "custom", manually set that to high, then go back to "graphics" and set "extreme", do this a couple of time until they will eventually go away. It worked the first time in campaign, had a couple o tries in MP. It seems SLI doesn't like "advance settings" crysis 2 has to offer.