I recently just re-worked my custom water cooling loop. I am curious as to why my CPU temp reads 10-12°C higher then GPU. To get some context of the loop. It splits coming out of the pump and goes to the CPU and GPU on their own line. (I have had it like this for years now with no major temp differences.) Then coming out of the CPU it combines back with the out side of the GPU.(Which is the newer portion, essentially using it as a Tee) after that is goes to the cooler, then back to the res/pump. My assumption is the water being pushed out of the GPU is causing the water coming from the CPU to be slowed. Which in turn makes that whole line slower allowing the heat to sit in the water block. However, it wasn't always like that. When I first changed it they use to sit within 1-2°C of each other and slowly climb together. So, I'm not quite sure if my theory is right because this issue would have been there sense the beginning. But I can't think of another reason as to why it is different now. I am also only getting these reading through monitoring software(Haven't looked into physical reading sensors). Which with the ones I have looked at come back with the same results. It isn't a big issue because my temps are still lower then any concerning temps. Just curious if anyone has any other ideas.