You can buy all that top notch hardware for pcs, and still have paid only half the cost of a mac.
Fans are a available for gfx and processors that are quieter than the human heartbeat...
and as for that 486, that would be the stupidist thing ever.
No other part of the motherboard would have the bandwidth to cope with that processing power, it would be useless, its probably the same to some extent with the Mac.
If you don't have faster memory and system bridges, that processor will be wasted mainly.
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) in which mac is the king.