Shouldn't the 197.13 beta be for SLI too? It has fixes and also supports SLi for GTA IV.
A few older games have issues with SLI setups starting with 195 drivers and up. (Crysis minimum FPS bug, performance far worse than 186.18/191.07, etc...). For this reason I don't recommend them as they are not best "overall", but feel free to experiment. Always good to hear more input.
"Performance isn't everything, it's the ONLY thing"