I think I read a rule that every 10c tempeprature drop gives about +30mhz.
A better waterblock will let you clock higher but it is often not noticable. However a worse block wont cope with heat loads as high as a good block which means when you increase voltage the block wont be able to take away all of the heat and some will build up making the % overclock worse with more voltage. Also I would assume elctromigration happens slower when using a better block as the chips temperature will be lower, allowing you to use more voltage safely
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