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The Z4 is about the same height as a Pico, isn't it? I think if the Pico can fit in the S4 Mini for instance, so would the other one. Bigger heatsinks would either make it flare out on the sides, or maybe you're thinking of extra-tall heatsinks like those in some ram modules. Extra-tall heatsinks would be more justified in those small PSUs than on DIMMs which are just more for style than practicality.
