Can't really suggest it since the cooling and power have been optimized for the specific parts in the G20AJ. Upgrading it won't be a simple task at all, so be prepared. For more info, you can check out this thread:
https://rog.asus.com/forum/showthrea...G-G20-Overhaul
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FPS, Racing, and VR Gamer / Tech Enthusiast / ROG Admin