I got the MSI CX61 and the performance is not what it should be. Doom 3 and Doom 3 BFG won't run because of a OGL error related to optimus, and Skyrim runs slow EVEN on low settings. This is all because of optimus, which is software that chooses which GPU will process graphics, the Nvidia or the onboard Intel HD 4000. But even when the Nvidia is being used, the performance takes a huge hit. There is no way to disable optimus in the BIOS, and the Nvidia card is outputting graphics *through* the Intel card, which means optimus cannot be disabled in any way, otherwise the Nvidia card will not be recognized. I am going to return my MSI and get something else, something that allows diabling of optimus in the BIOS. I suggest you do the same. Optimus is cancer. And there are tons of other games that don't work with optimus, and the Nvidia GPU will not output desktop, chrome, or VLC media player graphics. So all those things will be slow. Sigh... *rolleyes*
I've tried disabling the Intel GPU in device manager (and uninstalling it). Both ways, the Nvidia GPU stops being recognized. Sigh...