If you have antialiasing off, it won't show up. It's a bug in games with AA or FXAA where if you have that turned on, the smoothed edges disappear. I noticed it as soon as I walked out into snow. They have said it will be fixed in the actual 12.3 update. Fingers crossed.
Oh, and someone else told me it borks your GPU's ability to control its fan settings and heat, but I didn't notice anything like that in the short time I had it installed.