8xmsaa gives a better IQ to 16qcsaa basically the latter is just a trick to try and show 16xaa but with tweaks and gives to performance impact of 4x or 8x I am not sure which one. Its meant to try and give the best IQ with a smaller hit to fps then msaa sometimes has. I have 4xmsaa enabled in options and its fine. By the way on topic. This game is freaking amazing! I am running it maxed out 4xmsaa and getting 90-150fps during races! Much much much better optimized than Dirt Showdown was that game was a piece of crap. Set GI on in that game and it would just freak out and fps would drop as low as 30fps. Now in this, with all the Intel options forced on as well in .xml file 90+fps! The game looks gorgeous!