TEC assisted CPU waterblock concept

[Marios]

I think the water at room temperature doesn't have the time to get chilled.
The CPU is hot and it only gets chilled at the center where there is immediate contact between the central copper piece of the 4th plate and the third plate.

Scarlet Infidel
No, One loop is enough. A splitter in and a join out.
This way the water never gets too cold.