DISAGREE.
While the 5XXGTX cards might provide the most performance/best performance if you've got the money, there's nothing that says you couldn't get a couple ATI/older cards and run multiples of them and split performance of slave instances between them. And while the power usage/heat might not be worth it, there's nothing saying a couple gray market (used) cards wouldn't be less expensive than a 5XXGTX card.
But this is just me arguing for the sake to argue.
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