KEITHRH12

Do you need a bridge to use it, like SLI?

Afrodisiac

No.

These are the scenarios:
You get a second 9800GTX+. You can put on an SLI bridge, SLI them and then PhysX will be run on one of them (as per Nvidia's FAQ), or
You don't put on an SLI bridge and make the second 9800GTX+ be a dedicated PhysX card, or
You get another card like a 9600GSO and make that dedicated PhysX card (with no bridge).

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