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If you game, you would want the pci version. That way there is no latency in movement or commands due an external modem/router and cabling. If not, a router will add a very stout layer of security. A good firewall would round it out.
I suspect that there may be a problem with that particular pci modem, and you should send it back. Anything that is pci and halts the system is most likely dead.
My .02
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