Hello!
I Have Asus ROG G550J with CPU SR15E (INTEL CORE I7-4700HQ) and GPU N15P-GT-A2 (NVIDIA GEFORCE GTX 850M).
It has problem with intel HD graphics (HD4600). Laptop gets many BSOD and others.
I have remove BGA CPU and replaced it with new Intel i5-4210H.
From now on laptop works ok on...