hi I heard that if you buy a mac pro you can replace or customize the hardware much like u would with a pc. of course this voids the warranty but the point is it can be done safely. so i'm wondering exactly which parts can be replaced and which can't. i've heard u can add ur own memory and replace the graphics card but what about cpus, powersupplies, motherboards, hard drives, and all the others.
thx
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