I have a GeForce 8400M GS in my notebook (see full specs in sig) and when I install RC1 I automatically download the 181.71 driver which I remember was getting a lot of hype a few months ago. It works pretty well. Then I went to the Nvidia website and checked for any newer drivers for my GPU and it gives me 185.85. So I download and install it, and I see no difference except that with 181.71, if I right click on the desktop I get an immediate reaction. 185.85 gives a slight <1 second lag before reacting. I rolled back my driver, but I'm wondering if there's any reason I should go for 185.85 over 181.71.