Hello, Love the work you've been doing here, I didn't even realize my m17x R3 could be upgraded until I stumbled across this forum. Question though: How do you know which line to modify in the inf file? The 335.23 drivers seem to have multiple lines pointing to the 780m under: "NVIDIA Windows (64 bit) Driver Library Installation Disk 1" NVIDIA_DEV.119F.05AA.1028 = "NVIDIA GeForce GTX 780M" NVIDIA_DEV.119F.05AB.1028 = "NVIDIA GeForce GTX 780M " NVIDIA_DEV.119F.05AD.1028 = "NVIDIA GeForce GTX 780M " NVIDIA_DEV.119F.05AE.1028 = "NVIDIA GeForce GTX 780M " Cheers