Size of Peltier?

[Gentleman]

Is it bad for a peltier to overhang the WB? The one I just got is like 5mm bigger than my WB so I was wondering if I need to get a diff one or would it still work?

Thx

 

[matttheniceguy]

yep, it's deffinatly bad. The part of the pelt that isn't touching the waterblock will have no cooling, and will overheat very quickly. You could still use this waterblock and use a copper plate between it and the pelt, like you do for the cpu, but it would be best to just get a bigger waterblock.

 

[squeakygeek]

I agree with matt, but I don't think the purchase of a new waterblock is warranted if you can get a heatspreader in there. It doesn't have to be as thick as a coldplate since you don't need hardly any lateral conduction. 1/8" should be plenty thick, but you could probably go even thinner than that if you had to.