Generally speaking: nope. I agree with kutulu. Although in theory, aluminium cases are better at transfering heat, in practice most heat is moved out by the air circulation. When you *need* the heat transfer of your case to keep your case cool enough, you're probably running too hot anyway.
I'd say the main benefit of aluminium cases is the weight reduction. That, and the coolness factor, 'cause they're usually "design" cases.
(I have a steel Chieftec case, which is pretty damn cold to the touch, and has limited airflow for sound reasons.)
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