You can use Aluminium or Copper, but we would highly recommend Copper if you're going to have a large heatload (from overclocking/overvolting).
Theoretically, you can use either metal, but the design should be slightly different (i.e. baseplate thickness, fin width,...) in order to compensate for the different heat density/thermal resistance, and if you look at the figures, you'll find that Alu will give you a lower heat dissipation than copper, but you should be able to compensate for that, a bit, with a big pump.
The main concern (for me) is avoiding galvanic corrosion, which comes from using different metals (block and rad). Although I will have some brass parts in my rig (from the heatercore), it is a very small source of corrosion, compared to a copper/brass and aluminium combo. The heatercore will eventually be removed, as I switch to another cooling solution.
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