If the TEC's are the same as what I think they are 172W @ 24V with a max delta T of about 69C.
First yes they can move 350W @ 0deg C dT. Second at 18V and cooling a 70W (just a round number as an example) load under great conditions (20C water temp) you could expect to get about 5 to 10 C at the CPU. (straight out of kryotherm's calc).
Just a simplistic model to let you know what to really expect.
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