The water cant be moving at all. The goal is to have IHS/waterblock interface temp at >70C for reflow to occur (inidigo melts according to their site at 70C, I would thought a little higher, but just read it). With water cooling/flowing a gradient higher than 30C will exist from core to IHS/waterblock, so even if core temp = 100C, indigo wont reflow. So pump has to be off, so gradient from core to IHS/waterblock is small enough to allow high enough temp.
Same reason you should not get reflow while loading your cpu to 100C, as long as you are cooling cpu.





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