I have a Macbook Pro Retina 15'' mid 2012 using bootcamp Windows 8.1 I've recently been noticing how my GPU the GT 650M is staying in P8 when I game which results in 68MHz clock with 98% load causing extreme lag. I've tried locking the P-state by creating a bat file with "nvidiaInspector.exe -forcepstate:0,1" in the same folder as NVIDIA Inspector (which was the highest recommended strategy on the forums). However the issue persisted, so I tried using NIVIDIA Bios editor however I got an error when it tried reading the bios. Any suggestions? I need to lock the P-state so my clocks will run at their best 900MHz/2000MHz instead of 13% of their maximum.