Hi. Let me get this straight, because maybe I don't get something. It's OK with stock heatsink? But when you add 1.2mm plate on the heatsink in the place of gpu die and you install it cpu temps are mess?
I quickly checked how this heatsink looks like and it's two plates basically with shared heatpipes. So if you add at one side/gpu 1.2mm height... I don't see how could you clamp it down on the cpu side? Logically thinking cpu side/ die plate/ has to be raised that same amount - 1.2mm to maintain that same level a flatness of the whole heatsink. If ou added height at gpu side and screwed down heatsink everywhere/ including cpu side/ it had to bend the heatsink (I guess heatpipes itself between gpu and cpu). There is no way that cpu side is sitting flat on the cpu itself. Maybe is touching in some place but surely it's not sitting on the whole die. That's just my guess. Check everything closely again. There has to be something bent. Maybe photo would share some light and give clues.
