An ideal place to start would be to measure the water temperature and the temp near to the hot side of the peltiers. just to see if the peltiers/heatsink are getting rid of the heat well enough. It is an unusual setup and I'm thinking that either the heatsink isn't big enough to dissipate the required heat as 4 peltiers will be putting out quite a bit, in addition to the cpu and video card or the small heat exchangers aren't doing a very good job of transfering the heat in the water to the heatsink.
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