Heat Dissipation-aluminum vs steel

I have heard that aluminum cases may "wick" away heat from the pc, while steel does not. Does anyone have any views on this? Any input is welcome.

It's a hoax. Metallurgically, we all know Aluminum is a better conductor of heat than steel... But due to the airflow in one's case, the effect of this extra conductivity is pretty much null.

One area where it MIGHT help, are PSU's that are touching aluminum on all sides... For example, the Coolermaster Centurion 5. I've noticed that the top steel panel gets mighty warm from a loaded PSU, so aluminum might help there, but I doubt it.

I was wondering the same thing awhile back. I googled it and found this article.

http://www.systemcooling.com/alum_steel-01.html

Should answer all your questions.