I read a post on another forum where a user had two BFG cards and still couldn't get the SLI function to work. Turned out the firmware was different on the two cards.
I went with an MSI NX6600GT-TD128E which is their PCI-E card. I've combined it with a MSI K8N Neo4 Platinum/SLI, so that I can add another when I'm ready for SLI goodness.
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