recommend USB 3 PCI card for Mac Pro (it's not built in in this model)

Thanks for the info, Williamio!  What has been your experience in using the Caldigit card with memory card readers?  I currently have a Hoodman Raw Steel USB3.0 reader to read my SD and CF cards.  Do you happen to know if it works?  Actually, would you please list any/all readers that you know work -- I'd be willing to buy a new reader if necessary.

TIA

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Karl