Well, thinking about it, it would seem that grounding the blocks will simply provide both copper and aluminium parts of the block an infinite supply of electrons. So, in effect there will be no net change on the overall battery effect since both copper and aluminium have had an equal amount of 'ground' applied to each of them:
eg.
al + ground = copper + ground
(therefore 'ground' cancels out to give)
al = copper
(hope that makes sense)
But grounding blocks should have some positive EMI effects, especially when they're so close to the CPU. For anyone who hasn't read Chieftec's factory tour at THG, it seems that no matter how small a case window a PC has, it will not pass their EMI tests. Scary...
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