So, I've recently learned (the hard way) that with the current version of the Trim Enabler you can't have both it enabled and the Nvidia web drivers if you're running Yosemite: http://www.cindori.org/forums/topic/trim-enabler-conflict-with-nvidia-drivers/ I can verify the behaviour since I just swapped GPUs and am using an unflashed GTX 970 now. *If* I turn on Trim Enabler it will work fine, but then the system will always come up with the default OSX driver for the Nvidia card rather than the web drivers. (which means with nothing but the 970 in there it doesn't work) I'm kinda surprised that nobody here has mentioned this issue yet as it seems to be based on the fact that both require the use of NVRAM parameters when the system boots. Is there a previous version of the drivers or the enabler that doesn't mind the two parameters and works? Anyone have a working Yosemite install with both enabled?