Copper is better. The results will be different depending on the block, but all in all copper is better. I still use AL blocks like the one I made in my avatar and it works great. Running a XP1600+@1740mhz 2.0Vcore just fine with it. Temps are low. Aluminum is definatly usable, but copper will shave a few degrees off most any block in any design. I like aluminum because it is easy to work with and works just fine for what I need it to do.
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